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: Surgery
True about hydatid diseasea) MC site is lungb) Pre-op. Albendazole followed by surgery is the t/t of choicec) 20% saline is scolicidald) Puncture, aspiration, injection, and respiration (PAIR) done in hepatic hydatids. 
Select and explain. 
A. cd, B. bc, C. bd, D. ac
C: bd
Answer: C: bd 
Explanation: Most common site is liver followed by lung. Other sites which may be involved by E. granulosus are


abdominal cavity
kidney
	brain
bone


Scolicidal agents used in hydatid surgery


20% hypertonic saline
0.5% silver nitrate
95% sterile ethanol
Absolute alcohol
Mebendazole 2.4 µg/ml
There is no place for the use of formaldehyde as a scolicidal agent.