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: Medicine
[{'content': 'True or false\n1.  Bronchoscopy with BAL is mainstay of diagnosis for pneumocystic pneumonia\n 2. Pneumatoceles are seen in all cases of pneumocystic pneumonia\n3.  CD4 count < 350 /µL is indication for prophylaxis against pneumocyctis carini pneumonia\n 4. Trimethoprim - sulfamethoxazole is drug of choice for prophylaxis. \nSelect and explain. \nA. 1 - True, 2 - False, 3 - False, 4 - True, B. 1 - False, 2 - True , 3 -True , 4 - False, C. 1 - True, 2 -True, 3 - False, 4 - True, D. 1 - False, 2 - False , 3 -True , 4 - False', 'role': 'user'}, {'content': 'Answer: A \nExplanation: CD4\xa0count <200 /µL is indication for prophylaxis.\nPneumatoceles may be seen, but not in all cases.', 'role': 'assistant'}]