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': 'Use of an angled target in the X-ray tube \nSelect and explain. \nA. Increases penetrating power of X-rays, B. Reduces penetrating power of X-rays, C. Increases image sharpness, D. Reduces image sharpness', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]