Question: What is the beginning date of this inaugural season of a new FIA Champoinship for electrically powered cars, in which the Buenos Aires ePrix was first raced?
{'answer': '13 September 2014', 'supporting_facts': [['Buenos Aires ePrix', 0], ['Buenos Aires ePrix', 1], ['2014–15 Formula E season', 0], ['2014–15 Formula E season', 1]]}