Question: Police officers, armed with model MarkV-A1, were shot at the end of a protest against police killings of Alton Sterling in Baton Rouge, Louisiana, and Philando Castile in Falcon Heights, Minnesota, what was used to disable the shooter?
{'answer': 'C4', 'supporting_facts': [['MarkV-A1', 0], ['MarkV-A1', 1], ['2016 shooting of Dallas police officers', 0]]}