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': 'A direct-acting cholinomimetic that is lipid soluble and has been used in the treatment of glaucoma is: \nSelect and explain. \nA. Acetylcholine, B. Physostigmine, C. Pilocarpine, D. Neostigmine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Directly acting- Pilocarpine\nIndirectly acting- Physostigmine', 'role': 'assistant'}]