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: Physiology
[{'content': 'A 65 years old male is having weight 60kg and serum creatining 3mg/d1. What is creatinine clearance \nSelect and explain. \nA. 5, B. 10, C. 15, D. 20', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans: D. 20(Ref: Textbook of clinical nephrology 4'h/e p. 136)Creatinine clearance is calculated by Cockcroft-Gault equation :-Creatinine clearance = / 72 x serum creatinine in mg/dl.Creatinine clearance = / 72 x 3 = 20.83 ml/minNote:In females the values are multiplied by 0.S5.Thus, for same values, creatinine clearance in female of 65 years = 17.7 (20.83 x 0.85).", 'role': 'assistant'}]