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: Pharmacology
[{'content': 'Anticholinesterases are effective against all, except : \nSelect and explain. \nA. Cobra bite., B. Postoperative ileus., C. Carbamate poisoning., D. Belladona poisoning.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]