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': 'In infants, defecation often following meal. The cause of colonic contraction in this situation is \nSelect and explain. \nA. Gastroileal reflex, B. Enterogastric reflex, C. Increased circulation levels of CCK, D. Gastrocolic - reflex', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. (d) Gastrocolic - reflex(Ref: Ganong, 25th ed/p.504)Distension of the stomach by food - causes contractions of the rectum leading to defecation. This reflex is called gastrocolic reflex', 'role': 'assistant'}]