This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Imaging of Alveolar Lung Disease, Subject name: Radiology
[{'content': 'Water lily sign on chest X ray is seen in - \nSelect and explain. \nA. Tuberculosis, B. Hydatid cyst, C. Cryptococcosis, D. Aspergillosis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 4b' i.e., Hydatid cysto Radiological signs of hydatid cyst of lungMeniscus signWater-lilly signCamalote signRising sun signSerpent signEmpty cyst sign", 'role': 'assistant'}]