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
Mr. James has just been diagnosed with myasthenia gravis. You are his physician and are considering different therapies for his disease. Neostigmine and pyridostigmine may cause which one of the following ? 
Select and explain. 
A. Bronchodilation, B. Diarrhea, C. Cycloplegia, D. Irreversible inhibition of acetylcholinesterase
B: Diarrhea
Answer: B: Diarrhea 
Explanation: They cause cholinergic adverse effects - Diarrhoea, increase secretions.