Question: As of May 2017, Anthony Joshua is ranked as the world's best heavyweight by the Transnational Boxing Rankings Board and BoxRec, the second British boxer, after which British professional boxer, to win both a gold medal at the Olympics and a world title by a major professional sanctioning body, as well as being the first British heavyweight to do so?
{'answer': 'James Frederick DeGale', 'supporting_facts': [['Anthony Joshua', 2], ['James DeGale', 0]]}