This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Imaging of Interstitial Lung Disease, Subject name: Radiology
[{'content': 'Water lily sign on chest X-ray is seen in - \nSelect and explain. \nA. Pulmonary Tuberculosis, B. Pulmonary Hydatid cyst, C. Cryptococcosis, D. Aspergillosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is B.', 'role': 'assistant'}]