Given two are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R)

Assertion (A) : All machines suffer a loss of efficiency due to the frictional force acting on any moving member of the machine.

Reason (R) : The frictional force can be reduced by providing a thin film of lubricant between any two meeting parts.

In the light of the above statements, choose the most appropriate answer from the options given below:

Both A and R are correct and R is NOT the correct explanation of A

The reason (R) states that frictional force can be reduced by providing a thin film of lubricant, but this does not explain why machines suffer a loss of efficiency due to frictional force.

The assertion (A) is still true, but the reason (R) does not provide a logical explanation for it.

Thus, "Both A and R are correct and R is NOT the correct explanation of A" is correct.