This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardio thoracic surgery  , Subject name: Surgery
Which of the following is not a sign of pulmonary hydatidosis? 
Select and explain. 
A. Water lily sign, B. Rising sun sign, C. Meniscus sign, D. Drooping lily sign
D: Drooping lily sign
Answer: D: Drooping lily sign 
Explanation: Chest Xray of pulmonary hydatidosis shows a dense homogenous opacity.Ruptured hydatid cyst with collapsed laminated membrane produces irregular projections in a fluid level-'Water-lily' sign.It also shows 'Meniscus' sign or 'crescentic cap of air' when it communicates into bronchial tree.Other signs include 'Rising sun' or 'Daughter cyst' sign','Air-bubble'sign,etc. Reference:SRB's manual of surgery,5th edition,page no:1125