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
[{'content': 'Most common Hemoglobin in normal adult is: March 2005 \nSelect and explain. \nA. HbA, B. HbF, C. HbS, D. HbA2', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A: HbA In 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', 'role': 'assistant'}]