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: Pediatrics
[{'content': 'Pneumatocele is caused by – \nSelect and explain. \nA. Staphylococcus, B. Streptococcus, C. Streptococcus pneumoniae, D. P. carnii', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pneumatoceles\n\nThese are multiple thin walled air containing cysts.\nStaphylococcus aureus is the most common organism causing pneumatoceles and pneumatoceles are considered pathognomonic of staphylococcal pneumonia.\nE.coli and klebsiella pneumonia may have pneumatoceles. __\xa0O.P. Ghai 6th /e 350', 'role': 'assistant'}]