Assertion (A): Detergents easily remove oil and dirt from soiled garments.
Reason (R): Detergents increase the surface tension of water.

A) Both A and R are true and R is the correct explanation of A

B) Both A and R are 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

This MCQ is part of the UP PSC Previous Year Questions (PYQs) series, focusing on UPPSC Prelims 1997 (GS Paper I)