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
Poion of immunoglobulin molecule with molecular weight of 50,000 - 
Select and explain. 
A. Secretory piece, B. H Chain, C. L Chain, D. J piece
B: H Chain
Answer: B: H Chain 
Explanation: Ans. is 'b' i.e., H chain . The H chain has molecular weight of 50, 000. . The L chain has molecular weight of 25, 000.