This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Imaging of Lung Nodules and Masses, Subject name: Radiology
Water lily sign is seen in: 
Select and explain. 
A. Hydatid cyst of lung, B. Aspergilloma lung, C. T.B, D. Silicosis
A: Hydatid cyst of lung
Answer: A: Hydatid cyst of lung 
Explanation: Ans: A (Hydatid...) HYDATID LUNG Review of Radiology by Sumer Sethi 6th/59No or rare calcification in lungWater lily sign or Camalote sign (in chest X-ray)LUNG ECHINOCOCCOSIS Danhert Radiology manual 5th/493Water lily sign-completely collapsed crumpled cyst membrane floating on the cyst fluidSign ofCamalotteSerpent signCumbo signMeniscus signCrescent signHemartoma lung: Carney's triad & calcification-Danhert Radiology manual 5th/489Silicosis: eggshell calcification- WHO Manual of Radiological interpretation 1st/75