Assertion : Fatigue is the inability of a muscle to relax.
Reason : It is due to lactic acid accumulation by repeated contraction.

Options

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C. If the assertion is true but the reason is false
D. If the assertion is false but reason is true

Answer

D

Explanation

Muscle fatigue is the decline in ability of a muscle to generate force. It is resulted due to lactic acid accumulation in the muscle tissue reduces the pH making it more acidic and producing the stinging feeling in muscles when exercising. This further inhibits anaerobic respiration inducting fatigue.