This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Excretory System (Kidney, Bladder) Acid-Base Balance, Subject name: Physiology
[{'content': 'A 60-year old man, weighing 60 Kgs, has a plasma creatinine value of 3 mg/dL. How much is his creatinine clearance? \nSelect and explain. \nA. 22 mL/min, B. 44 mL/min, C. 66 mL/min, D. 88 mL/min', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Cockroft & Gault formula :- Ccr = x 0.85 (in females)/(72 X Pcr) Putting the given values into the equation, Ccr = /(72 X 3) Ccr=22.22 mL/min.', 'role': 'assistant'}]