Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): In the 'Meghaduta', the Mandakranta meter is exclusively used.
Reason (R): In the 'Meghaduta', a detailed description of nature (Prakriti-varnanam) is found.
In light of the above statements, choose the most appropriate answer from the options given below: