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 is preferred in treating opioid induced constipation \nSelect and explain. \nA. Linaclotide, B. Lubipristone, C. Alvimopan, D. Prucalopride', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Alvimopan is a peripheral opioid antagonist used against opioid induced constipation.', 'role': 'assistant'}]