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': 'Directly acting, lipid-soluble cholinomimetic among the following is: \nSelect and explain. \nA. Physostigmine., B. Pilocarpine., C. Atropine., D. Neostigmine.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: pilocarpine is directly acting while physostigmine is indirectly acting cholinomimetic and both are used for the treatment of glaucoma.', 'role': 'assistant'}]