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Question

______ has three active forms: retinal, retinol and retinoic acid.

This question was previously asked in
RRB NTPC 2019 CBT 1 Question Paper (8-Mar-2021) (Shift 2)
The correct answer is
Vitamin A

The question asks to identify the nutrient with three active forms: retinal, retinol, and retinoic acid.

Vitamin A Forms Explained

Vitamin A is a crucial fat-soluble vitamin known to exist in several active forms. The three primary active forms mentioned are:

  • Retinol: Essential for vision, immune function, reproduction, and cellular communication.
  • Retinal: Also known as aldehyde form, critical for the visual cycle (detecting light).
  • Retinoic Acid: Functions as a hormone, regulating cell growth, differentiation, and development.

These forms are interconvertible and play distinct but vital roles in the body. Therefore, Vitamin A is the correct answer.

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