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': 'To improve contrast, KVP must be \nSelect and explain. \nA. Increased, B. Decreased, C. Remain same, D. Contrast and KV P are not related at all.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: - To improve contrast, KVP must be decreased. - KVP is Directly propoional to Energy of X-rays /Quality/Penetration powerand Inversely propoional to Contrast.', 'role': 'assistant'}]