This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal System, Subject name: Physiology
Gastro-colic reflex is related to: 
Select and explain. 
A. Mass peristalsis, B. Segmentation contractions, C. Pendular movement, D. irritable bowel
A: Mass peristalsis
Answer: A: Mass peristalsis 
Explanation: Distension of the stomach by food initiates contractions of the rectum and, frequently, a desire to defecate. This response is called the gastrocolic reflex - related to mass movement (a modified form of peristalsis in large gut) This reflex is seen normally, paicularly in children, and not necessarily related to an irritable bowel.