Assertion : Growth is irreversible increase in mass of an organism during its life span.
Reason : Living organisms show internal growth due to addition of materials and formation of cells inside the body.
(a) If both A and R are true and R is the correct explanation of A
(b) If both A and R are true but R is not the correct explanation of A
(c) If A is true but R is false
(d) If both A and R are false.