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: Microbiology
Heavy chain of IgA is ? 
Select and explain. 
A. Gamma, B. Mu, C. Delta, D. Alpha
D: Alpha
Answer: D: Alpha 
Explanation: Ans. is 'd' i.e., Alpha Ig G y (gamma)Ig Aa (alpha)IgM 1.1 (mu)Ig D(delta)Ig E e (epsilon)