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
Anticholinesterase with effect on CNS is: 
Select and explain. 
A. Neostigmine, B. Pyridostigmine, C. Physostigmine, D. Edrophonium
C: Physostigmine
Answer: C: Physostigmine 
Explanation: None