This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Acute and Chronic Kidney Disease, Subject name: Pediatrics
In Schwaz formula for calculation of creatinine clearance in a child, the constant depends on the following EXCEPT 
Select and explain. 
A. Age, B. Method of estimation of creatinine, C. Mass, D. Severity of renal failure
D: Severity of renal failure
Answer: D: Severity of renal failure 
Explanation: Schwaz formula (for creatine clearance in child) is Creatinine clearance = K x height/creatinine K = constant that depends upon age, muscle mass, method of creatinine estimation.