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
[{'content': 'Poion of immunoglobulin molecule with molecular weight of 50,000- \nSelect and explain. \nA. Secretory piece, B. H chain, C. L chain, D. j piece', 'role': 'user'}, {'content': "Answer: B \nExplanation: 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>", 'role': 'assistant'}]