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: Radiology
[{'content': 'What is the average wavelength of the x-ray used in dentistry is: \nSelect and explain. \nA. 0.6-1A°., B. 1-2A°., C. 0.5-2A°., D. 2-2.5A°.', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Average wavelength of the x-ray used in dentistry is 0.6-1A°.', 'role': 'assistant'}]