Question: Which Big East champion began his NBA career with the Celtics in 2007?
{'answer': 'Jeff Green', 'supporting_facts': [["2007 Big East Men's Basketball Tournament", 0], ["2007 Big East Men's Basketball Tournament", 1], ["2007 Big East Men's Basketball Tournament", 2], ["2007 Big East Men's Basketball Tournament", 3], ['Jeff Green (basketball)', 1]]}