Question: The attack on what city in Libya by members of the Islamic group Ansar al-Sharia led to the formation of a committee with Trey Gowdy as it's chairman?
{'answer': 'Benghazi', 'supporting_facts': [['United States House Select Committee on Benghazi', 0], ['United States House Select Committee on Benghazi', 3], ['2012 Benghazi attack', 0]]}