You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is True or false
1.  Bronchoscopy with BAL is mainstay of diagnosis for pneumocystic pneumonia
 2. Pneumatoceles are seen in all cases of pneumocystic pneumonia
3.  CD4 count < 350 /µL is indication for prophylaxis against pneumocyctis carini pneumonia
 4. Trimethoprim - sulfamethoxazole is drug of choice for prophylaxis. and explain in detail?
CD4 count <200 /µL is indication for prophylaxis.
Pneumatoceles may be seen, but not in all cases.