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': 'Radiation dose to patient can be reduced by all of the following except \nSelect and explain. \nA. Speed film, B. Filters, C. By increasing target object distance, D. Decreasing kilovoltage potential', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Increasing kVp potential reduces radiation exposure dose.', 'role': 'assistant'}]