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': 'DOC for belladona poisoning \nSelect and explain. \nA. Neostigmine, B. Physostigmine, C. Pyridostigmine, D. Edrophonium', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Physostigmine is an anticholinesterase & chemically it is a tertiary amine which can cross BBB.\nIt is DOC for Belladona, Datura & Atropine poisoning.', 'role': 'assistant'}]