The correct option is A <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
The Ashtadhyayi
The Ashtadhyayi, written by grammarian Panini, is considered the standard work on Sanskrit grammar. Patanjali wrote Mahabhashya. It explains the principles given in Panini's Ashtadhyayi.