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
[{'content': 'Which of the following is class specific antigenic determinants of an Ig \nSelect and explain. \nA. L-chain, B. H-chain, C. J-chain, D. Variable region', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) H-chain Ref A nan thunnrinian 8/e, p 96, 9/e, p 94 It is the class of heavy chain (H) which determines class of Ig, e.g. gamma (y), alpha (a), mu (u), delta (6), epsilon (e) are H chain of IgG, IgA, IgM, IgD, IgE, respectively.', 'role': 'assistant'}]