Assertion (A): Compressors, the polytropic efficiency is always greater than the isentropic efficiency.
Reason (R): Higher the pressure rations, the greater is the polytropic efficiency.
a. Both A and R are individually true and R is the correct explanation of A
b. Both A and R are individually true but R is not the correct explanation of A
c. A is true but R is false
d. A is false but R is true