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': 'Three radiographs of the same tooth, taken using a digital intra-oral X-ray system, an intensifying screen/film cassette combination and conventional dental film (F speed). Which of the following X ray is taken with conventional dental film? \nSelect and explain. \nA. A, B. B, C. C, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]