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': 'Pacemaker cells for the system are located in? \nSelect and explain. \nA. Stomach, B. Duodenum, C. Jejunum, D. Large intestine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Stomach(Ref: Ganong, 25th ed/p.496)Pacemaker cells of GIT are interstitial cells of CajalThey are located in the midbody region of stomach along the greater curvature', 'role': 'assistant'}]