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: Radiology
[{'content': 'Water lilly sign is seen in chest X-ray of : \nSelect and explain. \nA. Pulmonary hypoplasia, B. Echinococcus, C. Pneumonia, D. Sarcoidosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: D i.e. Bronchogenic carcinoma', 'role': 'assistant'}]