Question: what kind of triangle has a 90 degree angle
[{'answer': 'A right triangle', 'provenance': [{'wikipedia_id': '39420', 'title': 'Right triangle', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '39420', 'title': 'Right triangle', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 250, 'bleu_score': 0.8752376177722321, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10164469576669568220}, 'section': 'Section::::Abstract.'}]}]