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
[{'content': 'During surgical exploration for hydatid cyst of the liver, any of the following agents can be used as a scolicidal agent except \nSelect and explain. \nA. Hypeonic sodium chloride, B. Formalin, C. Cetrimide, D. Povidone iodine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: .', 'role': 'assistant'}]