Match List-I with List-II and select the correct answer using the code given below the lists:
List-I (Blood picture) List-II (Type of Anaemia) A Microcytic, hypochromic red cells 1 Vitamin $B_{12}$ deficiency anaemia B Macrocytic, hypochromic red cells 2 Thalassemia major C Large number of early, intermediate and late erythroblasts 3 Aplastic anaemia D Low reticulocyte count 4 Iron-deficiency anaemia
A-4, B-1, C-2, D-3
This question requires matching specific blood picture characteristics (List-I) with the corresponding types of anaemia (List-II). We will analyze each item in List-I and find its best match in List-II.
Microcytic (small size) and hypochromic (pale colour due to low hemoglobin) red blood cells are hallmark features of iron-deficiency anaemia. This occurs because iron is essential for hemoglobin synthesis.
Macrocytic (large size) red cells typically indicate defects in DNA synthesis. Vitamin $B_{12}$ deficiency anaemia (also known as pernicious anaemia or megaloblastic anaemia) is a primary cause of macrocytosis. While typically described as macrocytic, some sources may mention associated hypochromia in certain contexts or mixed deficiencies.
The presence of numerous immature red blood cells (erythroblasts at various stages) in the peripheral blood signifies severe ineffective erythropoiesis or extramedullary hematopoiesis. Thalassemia major is characterized by significant ineffective erythropoiesis and hemolysis, leading to such findings.
Reticulocytes are immature red blood cells. A low reticulocyte count indicates that the bone marrow's production of red blood cells is inadequate. Aplastic anaemia is a condition where the bone marrow fails to produce sufficient blood cells, resulting in low counts of all cell types, including reticulocytes.
Based on the analysis, the correct matching is:
| A | B | C | D |
| 4 | 1 | 2 | 3 |
This corresponds to Option 3 in the question.