In SCHWARTZ formula for calculation of creatinine clearance in a child, the constant depends on the following except –
(A) Age (B) Method of estimation of creatinine (C) Mass (D) Severity of renal failure
(D) 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