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': 'In AIDS patient presenting with fever, cough a diagnosis of pneumocystin pneumonia is best established by \nSelect and explain. \nA. CT scan chest, B. Bronchoalveolar lavage, C. Staining of intra-nuclear inclusion with silver staining, D. Aspiration and culture', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Bronchoalveolar lavage Diagnosis of PCP requires Demonstration of the organism in samples obtained from induced sputum. Bronchoalveolar lavage, transbronchial biopsy, or open-lung biopsy. If the histological examination fails :? u PCR is required to make the diagnosis", 'role': 'assistant'}]