This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: X-RAYS, Subject name: Radiology
[{'content': 'International Day of Radiology is celebrated on \nSelect and explain. \nA. 6th November, B. 7th November, C. 8th November, D. 9th November', 'role': 'user'}, {'content': 'Answer: C \nExplanation: 8th November of each year is celebrated as International Day of Radiology(IDOR) X Rays were discovered by W.C.Roentgen on 8th November 1895, so 8th November is celebrated as International Day of Radiology every year. Theme for IDOR 2019: spos imaging', 'role': 'assistant'}]