This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ANS, Subject name: Pharmacology
[{'content': 'You are being asked to give your expe opinion as a toxicologist regarding an effective antidote for belladonna poisoning. Which of the following agents would you suggest? \nSelect and explain. \nA. Neostigmine, B. Physostigmine, C. Pilocarpine, D. Atropine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: - Atropine is obtained from atropa belladonna. - It is non selective muscarinic receptor antagonist Physostigmine is the specific antidote for poisoning with belladonna . It crosses blood-brain barrier and antagonises both central and peripheral actions. Physostigmine sometimes itself induces hypotension, arrhythmias and undesirable central effects. It is therefore employed only as a last reso. Neostigmine does not block the central effect, but is less risky.', 'role': 'assistant'}]