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': 'The major initiating response for peristalsis is \nSelect and explain. \nA. Hormonal, B. Local stretching of gut, C. Neural, D. Gastric acid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The major initiating response for peristalsis is local stretching of the gut. Peristalsis is a reflex that is initiated when the gut wall is stretched by the contents of the lumen. It occurs in all pas of the gastrointestinal tract from the esophagus to the rectum. The stretch initiates a circular contraction behind the stimulus and an area of relaxation in front of it. The wave of contraction then moves in an oral-to-caudal direction. This propels the contents of the lumen forward at rates that vary from 2 to 25 cm/s Ref: Ganong&;s Review of Medical Physiology 26th edition Pgno: 485', 'role': 'assistant'}]