This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (C.V.S.), Subject name: Medicine
[{'content': 'Judkins technique is used for? \nSelect and explain. \nA. Central venous line placement, B. Coronary arteriography, C. Renal angiography, D. Chest tube insertion', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) Coronary arteriographyRef: Braunwald's Heart Disease ninth edition chapter 20", 'role': 'assistant'}]