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': 'Actions of opiates in man include all except: \nSelect and explain. \nA. Constipation, B. Vomiting, C. Analgesia, D. Mydriasis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]