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
Water lily sign on chest X-ray is seen in - 
Select and explain. 
A. Pulmonary Tuberculosis, B. Pulmonary Hydatid cyst, C. Cryptococcosis, D. Aspergillosis
B: Pulmonary Hydatid cyst
Answer: B: Pulmonary Hydatid cyst 
Explanation: Ans. is B.