Question: what was the tallest mountain before mt everest was discovered
[{'answer': 'Kangchenjunga', 'provenance': [{'wikipedia_id': '10374104', 'title': 'List of past presumed highest mountains', 'start_paragraph_id': 5, 'start_character': 12, 'end_paragraph_id': 5, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]