This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: A.N.S., Subject name: Pharmacology
[{'content': 'Which of the following drugs increases gastro- intestinal motility? \nSelect and explain. \nA. Glycopyrrolate, B. Atropine, C. Neostigmine, D. Fentanyl', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. (C) Neostigmine(Ref: KDT 8th/e p130)Cholinergic drugs increase GI motility. Neostigmine is an inhibitor of the enzyme AChE (which is responsible for the breakdown of ACh). It thus acts like a cholinergic agent.Glycopyrrolate and atropine are anticholinergic drugs; thus reduce GI motility. Fentanyl is an opioid and can cause constipation.', 'role': 'assistant'}]