Question: who knocked out usa in 2014 world cup
[{'answer': 'Belgium', 'provenance': [{'wikipedia_id': '39425004', 'title': '2014 FIFA World Cup knockout stage', 'start_paragraph_id': 44, 'start_character': 176, 'end_paragraph_id': 44, 'end_character': 183, 'bleu_score': 1.0, 'section': 'Section::::Round of 16.:Argentina vs Switzerland.\n'}]}, {'provenance': [{'wikipedia_id': '39425004', 'title': '2014 FIFA World Cup knockout stage', 'start_paragraph_id': 48, 'start_character': 0, 'end_paragraph_id': 48, 'end_character': 685, 'bleu_score': 0.602822124075551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17957976163679226746}, 'section': 'Section::::Round of 16.:Belgium vs United States.\n'}]}]