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: Physiology
[{'content': 'Bulk mass contraction is seen in: March 2012 \nSelect and explain. \nA. Stomach, B. Duodenum, C. Ileum, D. Colon', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans: D i.e. ColonMass movement/mass peristalsis occur twice a day.A ring of constriction appears near the splenic flexure and travels down sweeping the descending colon, pushing the faeces into the rectum', 'role': 'assistant'}]