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
Floating water-lily sign is feature of: 
Select and explain. 
A. Lung Hydatid, B. Bronchial adenoma, C. Lung abscess, D. Aspergilloma
C: Lung abscess
Answer: C: Lung abscess 
Explanation: C i.e. Pulmonary Hamaoma Calcification type Condition associated Pop corn calcification Pulmonary hamaomaQ, mediastinal lymph nodes of acute histoplasmosis. Egg shell (peripheral) calcification SilicosisQ, SarcoidosisQ Rice grain calcification CysticercosisQ Tram track (Rail road) calcification Struge Weber syndromeQ Basal ganglion calcification Hyper parathyroidism Cardiac calcification Carcinoid syndrome Pericardial calcification Constructive pericarditis Not calcify Hydatid cyst in lungQ