The question asks us to find the pair that shares the same relationship as 'Mason : Plumb line'. This is an analogy question where we need to identify the relationship between the first pair and apply it to the given options.

Let's analyze the relationship between 'Mason' and 'Plumb line'.

• A Mason is a skilled craftsman who builds structures using materials like stone, brick, or concrete.
• A Plumb line is a tool used by masons to establish a true vertical line. It helps them ensure that walls are perfectly straight and perpendicular to the ground. It is a fundamental and essential tool for a mason's work.

So, the relationship is 'Person : A primary or essential tool used by that person in their profession'.

Analyzing the Options for the Analogy

Now, let's examine the given options to find the pair that exhibits a similar 'Person : Primary Tool' relationship.

1. Surgeon : Scalpel
   • A Surgeon is a medical professional who performs surgical operations.
   • A Scalpel is a small and extremely sharp bladed instrument used by surgeons to make incisions during surgery. It is a primary and essential tool for a surgeon.

   This pair shows a 'Person : Primary Tool' relationship, similar to 'Mason : Plumb line'.

2. Sculptor : Spade
   • A Sculptor is an artist who creates sculptures.
   • A Spade is a tool used for digging. While a sculptor might use digging tools for preparing materials or creating large-scale works, a spade is not typically considered the most defining or primary tool for all sculpting tasks (e.g., carving, modeling).

   This relationship is not as strong or direct as 'Person : Primary Tool' compared to the first option.

3. Blacksmith : Forcep
   • A Blacksmith is a craftsman who works with iron and steel.
   • A Forceps are typically used for gripping or holding objects, often in medical or laboratory settings. While blacksmiths use various tools for holding hot metal (like tongs), forceps are not the most common or primary defining tool associated with a blacksmith's main tasks like hammering or shaping metal on an anvil.

   This relationship doesn't fit the 'Person : Primary Tool' pattern as closely as the first option.

4. Gardener : Saw
   • A Gardener is a person who tends a garden.
   • A Saw is a tool used for cutting, often wood or branches. A gardener might use a saw for pruning, but it's one of many tools (trowel, hoe, shears, watering can, etc.) and not necessarily the single most primary or defining tool for all gardening activities.

   This relationship is also not as precise a fit for the 'Person : Primary Tool' analogy.

Comparing all the options, the pair 'Surgeon : Scalpel' best matches the relationship 'Person : Primary or essential tool used in their profession' observed in 'Mason : Plumb line'.

Conclusion on the Related Word Pair

Based on the analysis of the relationship between 'Mason' and 'Plumb line', and comparing it with the given options, the pair 'Surgeon : Scalpel' demonstrates the most similar relationship. A plumb line is a crucial tool for a mason, just as a scalpel is for a surgeon.

Revision Table: Analogy Relationships

Understanding different types of analogies is key to solving these questions.

Additional Information on Professions and Tools

Let's briefly look at some other tools commonly associated with the professions mentioned in the options:

• Mason: Trowel, spirit level, brick hammer, chisel, mortar mixer.
• Surgeon: Forceps, scissors, clamps, needles, sutures.
• Sculptor: Chisel, hammer, file, rasp, modeling tools (for clay), various cutting and shaping tools depending on the material (wood, stone, metal).
• Blacksmith: Hammer, tongs, anvil, forge, chisel, punch.
• Gardener: Trowel, hoe, rake, shears, pruning scissors, watering can, wheelbarrow.

This information further reinforces that the plumb line and the scalpel are particularly central tools for the mason and the surgeon, respectively.