This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: G.I.T, Subject name: Physiology
[{'content': 'While doing sigmoidoscopy, if the rectum is inflated with a gas increased peristalsis is seen in \nSelect and explain. \nA. Whole colon, B. Proximal colon, C. Distal colon, D. Whole intestine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Increase in intrarectal pressure initiates defecation reflex, so peristalsis increases in distal colon Ref: Ganong 25th ed/page 499', 'role': 'assistant'}]