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
While doing sigmoidoscopy, if the rectum is inflated with a gas increased peristalsis is seen in 
Select and explain. 
A. Whole colon, B. Proximal colon, C. Distal colon, D. Whole intestine
C: Distal colon
Answer: C: Distal colon 
Explanation: Increase in intrarectal pressure initiates defecation reflex, so peristalsis increases in distal colon Ref: Ganong 25th ed/page 499