This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Most common Hemoglobin in normal adult is:March 2005 
Select and explain. 
A. HbA, B. HbF, C. HbS, D. HbA2
A: HbA
Answer: A: HbA 
Explanation: Ans. A: HbAIn the embryo-Gower 1 (C2 r2) Gower 2 (a2E2)In the fetus: hemoglobin F (a2y2)In the adults:Hemoglobin A (GA) - The most common with a normal amount over 95%Hemoglobin A 2 (a26,) - Chain synthesis begins late in the third trimester and in adults, it has a normal range of 1.5-3.5%Hemoglobin A1c is increased in the patients with poorly controlled diabetes mellitus