This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'Major signs for AIDS case definition according to WHO is- \nSelect and explain. \nA. Generalized lymphadenopathy, B. Prolonged fever more than 1 month, C. Prolonged cough for > 1 month, D. Generalized pruritic dermatitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Major signs Weight loss greater than or equals to 10% of body weight Chronic diarrhea for more than 1 month Prolonged fever for more than 1 month (intermittent or constant ) Ref: PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition pg 348', 'role': 'assistant'}]