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': 'Higher kVp is \nSelect and explain. \nA. Disadvantageous to film, B. Disadvantageous to patient, C. Advantageous to film, D. All of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]