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: Dental
[{'content': 'Number of swallowings per day \nSelect and explain. \nA. 300, B. 400, C. 1500, D. 600', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]