This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
[{'content': 'Which of the following is not a carbamate? \nSelect and explain. \nA. Physostigmine, B. Neostigmine, C. Edrophonium, D. Pyridostigmine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (C) Edrophonium(Ref: KDT 8th/e p116, Katzung 11/e p104)Physostigmine, neostigmine and pyridostigmine are carbamates by chemical nature, whereas edrophonium is an alcohol.', 'role': 'assistant'}]