This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Pediatrics
[{'content': 'A child with pyoderma becomes toxic and presents with respiratory distress. His CXR shows patchy areas of consolidation and multiple bilateral thin walled air containing cysts. The most likely etiological agent in this case is: \nSelect and explain. \nA. Mycobacterium TB, B. Staph aureus, C. Mycobacterium avium intracellulare (MAC), D. Pneumocystis jiroveci', 'role': 'user'}, {'content': "Answer: B \nExplanation: b. Staph aureus(Ref: Nelson's 20/e p 2088-2093, Ghai 8/e p 379-381)The given chest X-ray finding is suggestive of pneumonia with pneumatoceles, seen in infection due to Staph aureus.", 'role': 'assistant'}]