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': 'MHC CLASS III CODES for all except – \nSelect and explain. \nA. complement C3, B. properdin, C. TNF –alpha, D. heat shock proteins.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]