This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
Why pyridostigmine is preferred in myasthenia gravis? 
Select and explain. 
A. It doesn't cross BBB, B. Longer acting than neostigmine, C. It crosses BBB, D. Sho-acting than neostigmine
B: Longer acting than neostigmine
Answer: B: Longer acting than neostigmine 
Explanation: DOC FOR myasthenia gravis is pyridostigmine as it long acting than neostigmine.both are quaternanry coumpounds and so cant cross BBB Ref: KDT 6th ed pg 101-102