Question: The Symphony No. 6 in B minor was first performed in Moscow on 4/16 December, conducted by  Russian pianist, teacher, conductor and composer also known as who?
{'answer': 'Wassily Safonoff', 'supporting_facts': [['Symphony No. 6 (Tchaikovsky)', 0], ['Symphony No. 6 (Tchaikovsky)', 5], ['Vasily Safonov', 0]]}