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': 'X-rays are discovered in \nSelect and explain. \nA. Nov 1897, B. Oct 1895, C. Nov 1895, D. Nov 1890', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]