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: Social & Preventive Medicine
[{'content': 'All are major criteria for AIDS except- \nSelect and explain. \nA. 10% weight loss, B. Diarrhoea for 1 month, C. Cough for 1 month, D. Fever for 1 month', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]