This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Medicine
[{'content': 'The most specific marker of renal function is- \nSelect and explain. \nA. Creatinine clearance, B. Insulin clearance, C. Blood area, D. Serum creatinine', 'role': 'user'}, {'content': "Answer: D \nExplanation: Creatinine is a waste product that is produced continuously during normal muscle breakdown. ... Creatinine clearance in a healthy young person is about 95 milliliters per minute for women/120 milliliters per minute for men. This means that each minute, that person's kidneys clear 95-120 mL of blood free of creatinine. Ref Harrison20th edition pg 293", 'role': 'assistant'}]