This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
You are being asked to give your expe opinion as a toxicologist regarding and effective antidot for belladonna poisoning .which of the following agents would you suggest 
Select and explain. 
A. Neostigmine, B. Physostigmine, C. Pilcocarpine, D. Methacholine
B: Physostigmine
Answer: B: Physostigmine 
Explanation: Ref-KDT 6/e p113,114 Being Teritiary amine,physostigmine can reverse.CNS manifestation of belladonna(source of atropine) poisoning. It is therefore, Prefered as an antidot for this type of poisoning