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: Pediatrics
In SCHWARTZ 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: Schwartz formula (for creatine clearance in child).

Creatinine clearance = K x height./ creatinine.
K = constant

K depends upon --> Age, Muscle mass, Method of creatinine estimation