Question: Azfar Hussain (Bengali: আজফার হোসেন ) is a Bangladeshi theorist, critic, academic, bilingual writer, poet, translator, and activist, Bengali, is also known by its endonym Bangla, it's the national, and official language of which country?
Sentence (from "Bengali language"): Dominant in the last group was Persian, which was also the source of some grammatical forms.
Relevant evidence: No