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
Which of the following drugs increases gastro–intestinal motility ? 
Select and explain. 
A. Glycopyrrolate, B. Atropine, C. Neostigmine, D. Fentanyl
C: Neostigmine
Answer: C: Neostigmine 
Explanation: None