This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Blood, Subject name: Pathology
Poikilocytosis is due to difference in: 
Select and explain. 
A. Size, B. Shape, C. Number, D. Width
B: Shape
Answer: B: Shape 
Explanation: Ans: b (Shape) Ref: Harshmohan,ed, p. 336Increase variation in shape of red cell is termed as poikilocytosis. Poikilocytes are produced in various types of abnormal erythropoesis.Eg:Megaloblastic anaemiaIron deficiency anaemiaThalassaemia. MyelosclerosisMicroangiopathic haemolytic anaemiaVariation in size is anisocytosis.