This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition, Subject name: Medicine
[{'content': 'Following drugs are used in IBS-Constipation Except \nSelect and explain. \nA. Lubiprostone, B. Tegaserod, C. Alosetron, D. Linaclotide', 'role': 'user'}, {'content': 'Answer: C \nExplanation: DRUG MECHANISM OF ACTION USED INTEGASEROD 5 HT4 AGONISTIBS -CONSTIPATIONLUBIPROSTONE STIMULATOR OF CHLORIDE CHANNELIBS -CONSTIPATIONLINACLOTIDE GUANYL CYCLASE C AGONIST IBS -CONSTIPATIONALOSETRON5-HT3 ANTAGONISTIBS-DIARRHEA', 'role': 'assistant'}]