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': 'The diameter of the largest arterial vessels in the pulp range from: \nSelect and explain. \nA. 50-100 μm, B. 101-150 μm, C. 151-200 μm, D. 201-250 μm', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]