This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Anatomy
During surgical exploration for hydatid cyst of the liver, any of the following agents can be used as a scolicidal agent except 
Select and explain. 
A. Hypeonic sodium chloride, B. Formalin, C. Cetrimide, D. Povidone iodine
B: Formalin
Answer: B: Formalin 
Explanation: .