Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : \( \mathrm{PH_3} \) has lower boiling point the \( \mathrm{NH_3} \).
Reason (R) : In liquid state \( \mathrm{NH_3} \) molecules are associated through vander Waal's forces, but \( \mathrm{PH_3} \) molecules are associated through hydrogen bonding.
In the light of the above statements, choose the most appropriate answer from the options given below:
