This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, 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: Antibody or immunoglobulin are glycoproteins molecules consisting of four polypeptide chains. - two identical heavy chains ( H) , molecular weight > 50 kDa. Two identical light chains (L), molecular weight > 25kDa. Reference : Anathanarayan & paniker's 9th edition, pg no: 94 <\p>