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 lily appearance in chest X-ray suggestive of the following condition: \nSelect and explain. \nA. Bronchiectasis, B. Bronchopleural fistula, C. Hydatid cyst, D. Sequestration cyst of lung', 'role': 'user'}, {'content': "Answer: C \nExplanation: Chest X-ray finding of hydatid cyst of the lung: Dense homogenous opacity Collapsed laminated membrane produces an irregular projections in a fluid level due to rupture of the cyst- 'Water-lily appearance' Crescentic cap of air, when it communicates into bronchial tree Ref: Srb's Manual of Surgery By Bhat, 2012, Page 1205.", 'role': 'assistant'}]