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: Medicine
[{'content': 'Gastric motility decreases in all EXCEPT \nSelect and explain. \nA. Diabetes, B. Upper abdominal surgery, C. Head injury, D. Hyper thyroid', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]