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
A direct acting cholinomimetics that is lipid soluble and has been used in the treatment of glaucoma is 
Select and explain. 
A. Acetylcholine, B. Physostigmine, C. Pilocarpine, D. Neostigmine
C: Pilocarpine
Answer: C: Pilocarpine 
Explanation: Ref-KDT 6/e p98 Pilocarpine is a directly acting and physostigmine-acetylcholine is an indirectly acting cholinomimetic useful for glaucoma.