Question: The composer Alexander Borodin, who wrote the opera Prince Igor, was a part of which group dedicated to producing a uniquely Russian kind of classical music? 
Sentence (from "Alexander Borodin"): Alexander Porfiryevich Borodin (Russian: Алекса́ндр Порфи́рьевич Бороди́н ; ] , 12 November 183327 February 1887) was a Russian Romantic composer of Georgian origin, as well as a doctor and chemist.
Relevant evidence: No