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': 'Antidote for belladonna poisoning: \nSelect and explain. \nA. Neostigmine, B. Physostigmine, C. Pilocarpine, D. Methacholine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. B. PhysostigmineBeing tertiary amine, Physostigmine can reverse the CNS manifestation of belladonna poisoning. Whereas neostigmine has very less CNS penetration.', 'role': 'assistant'}]