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
[{'content': 'Pacemaker complex of stomach is located in: \nSelect and explain. \nA. Fundus, B. Midpoion of the body of stomach, C. Pylorus, D. Gastro-duodenal junction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Pacemaker complex is located in the wall of the stomach near the midpoion of the body of stomach. Co-ordinated contractions of stomach, after the arrival of food, arise in this region of the stomach. These waves,are not action potentials. Instead, they are slow, undulating changes in the resting membrane potential.', 'role': 'assistant'}]