This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
Water lily sign is seen in 
Select and explain. 
A. TB, B. Aspergillosis, C. Hydatid cyst, D. Cryptococcosis
C: Hydatid cyst
Answer: C: Hydatid cyst 
Explanation: Classical signs of pulmonary hydatid cyst on chest X-rayUncomplicated hydatid cystComplicated hydatid cystWell circumscribed round radio-opacity (resembling canon ball on AP and rugby ball on lateral projection)Crescent signPolycyclic and bilobed appearanceCumbo or double arch signSlot sign (impending rupture)Waterlily or camelotte signRising sun signDry cyst sign(Ref: Chapman and Nakielny's Aids to Radiological Differential Diagnosis 6thEtd, page no.82)