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
Directly acting, lipid-soluble cholinomimetic among the following is: 
Select and explain. 
A. Physostigmine., B. Pilocarpine., C. Atropine., D. Neostigmine.
B: Pilocarpine.
Answer: B: Pilocarpine. 
Explanation: pilocarpine is directly acting while physostigmine is indirectly acting cholinomimetic and both are used for the treatment of glaucoma.