This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infection, Subject name: Medicine
[{'content': 'Pneumatocele is caused by? \nSelect and explain. \nA. Staphylococcus aureus, B. Streptococcus pyogenes, C. Hemophilus parainfluenzae, D. Mycoplasma pneumoniae', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Staphylococcus aureus* S. aureus is a cause of serious respiratory tract infections in newborns and infants; these infections present as shortness of breath, fever, and respiratory failure.* Chest X-ray may reveal pneumatocele (shaggy, thin- walled cavities). Pneumothorax and empyema are recognized complications of this infection.', 'role': 'assistant'}]