Assertion (A) : The temperature at which vapour pressure of a liquid is equal to the external pressure is called boiling temperature.
Reason (R ) : At high altitude, atmospheric pressure is high.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.