Assertion (A): The primary function of sweat is to facilitate a cooling effect on body surface.
Reason (R): Sweat excretes out NaCl and small amount of urea also.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.