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': 'Centenary year for X-ray is: \nSelect and explain. \nA. 1995, B. 1999, C. 1997, D. 2001', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. 1995', 'role': 'assistant'}]