Question: where does most of canada's electricity come from
[{'answer': 'Hydroelectricity', 'provenance': [{'wikipedia_id': '2082992', 'title': 'Electricity sector in Canada', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 16, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]