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
Food causes reflex defecation? 
Select and explain. 
A. Enterogastric reflex, B. Defecation reflex, C. Gastrocolic reflex, D. Rectoanal reflex
C: Gastrocolic reflex
Answer: C: Gastrocolic reflex 
Explanation: Ans. is'c'i.e., Gastrocolic reflex[Rel Guyton llth/e p. 771)Appearance of mass movements after a rneal is facilitated by gastrocolic and duodenum reflexes.These reflexes result from the distension of the stomach and duodenum.The best example of gastrocolic reflex is seen in early infancy where defecation often follows a meal.