Question: tallest mountain in the world before mount everest
[{'answer': 'K2', 'provenance': [{'wikipedia_id': '10374104', 'title': 'List of past presumed highest mountains', 'start_paragraph_id': 7, 'start_character': 12, 'end_paragraph_id': 7, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '10374104', 'title': 'List of past presumed highest mountains', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 513, 'bleu_score': 0.7714894395845421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12211918040522980264}, 'section': 'Section::::Abstract.'}]}]