Assertion (A): Human body produces highly toxic substances, which if not eliminated may cause the death.
Reason (R): Excretory substance removes nitrogenous waste from the body.
A.Both A and R are true and R is the correct explanation of A.
B.Both A and R are true but R is NOT the correct explanation of A.
C.A is true but R is false.
D.A is false and R is true.