This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pneumonia, Subject name: Medicine
[{'content': 'Comment on the first differential diagnosis of the CXR of a 50-year-old patient with cough for 2 weeks. \nSelect and explain. \nA. Round pneumonia, B. Lung abscess, C. Asbestosis coin lesion, D. Pulmonary hamaoma', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Given X ray suggests diagnosis of round pneumonia- caused by Pneumococcus Lung abscess - air fluid level with pus settling at the bottom Asbestosis coin lesion - present with occupational history. Pulmonary Hamaoma - popcorn appearance on CXR', 'role': 'assistant'}]