Which composer, a chemist by profession who studied under Balakirev, wrote the opera 'Prince Igor', left unfinished at his death and completed by Rimsky-Korsakov and Glazunov?

• A Alexander Borodin ✓
• B Mily Balakirev
• C César Cui
• D Anatoly Lyadov

Alexander Borodin was a professor of chemistry who composed in his spare time; his 'Polovtsian Dances' from 'Prince Igor' are among the most recognisable works in the classical repertoire.