This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
[{'content': 'Antiperistalsis is more commonly seen in \nSelect and explain. \nA. Colon, B. Jejunum, C. Ileum, D. Duodenum', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Excessive distention or irritation of the duodenum provides an especially strong stimulus for vomiting. In the early stages of excessive gastrointestinal irritation or overdistention, antiperistalsis begins to occur, often many minutes before vomiting appears.', 'role': 'assistant'}]