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
Bulk mass contraction is seen in: March 2012 
Select and explain. 
A. Stomach, B. Duodenum, C. Ileum, D. Colon
D: Colon
Answer: D: Colon 
Explanation: 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