Question: Who was the English conductor and Director of Music for the British Broadcasting Corporation, who first performed Ralph Vaughan William's Symphony No. 6?
{'answer': 'Sir Adrian Boult', 'supporting_facts': [['Symphony No. 6 (Vaughan Williams)', 0], ['Symphony No. 6 (Vaughan Williams)', 1], ['Adrian Boult', 0], ['Adrian Boult', 3]]}