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
[{'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: None', 'role': 'assistant'}]