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': 'An obese patient has heavy, thick hones. A good X-ray is taken with: \nSelect and explain. \nA. Increase in mA, B. Increase in KVP, C. Increased exposure time, D. Increased developing time', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. Increase in KVP', 'role': 'assistant'}]