This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory infections, Subject name: Pediatrics
[{'content': 'A child with pneumonia shows the following chest X-ray. Which of the following could be the most common underlying causative organism? \nSelect and explain. \nA. Mycobacterium tuberculosis, B. Hemophilus influenza, C. Streptococcus pneumoniae, D. Staphylococcus aureus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: * CXR shows consolidation in lung fields with pneumatocele: seen in Staphylococcal pneumonia', 'role': 'assistant'}]