Assertion. Rigor mortis is the state of body stiffening prior to death.
Reason. It is due to relaxation of action and myosin filaments.
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.