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 class specific antigenic determinants of an immunoglobulin is associated with ? \nSelect and explain. \nA. L-chain, B. H-chain, C. J-chain, D. Variable region', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]