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 precipitates at 50°C-60°C but disappears on heating - \nSelect and explain. \nA. Heavy chain, B. Light chain, C. Both, D. None of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]