Question: when was the last time the tungurahua volcano erupted
[{'answer': '1 February 2014', 'provenance': [{'wikipedia_id': '302242', 'title': 'Tungurahua', 'start_paragraph_id': 1, 'start_character': 344, 'end_paragraph_id': 1, 'end_character': 359, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '302242', 'title': 'Tungurahua', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 359, 'bleu_score': 0.764439679081068, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8189963408475142789}, 'section': 'Section::::Abstract.'}]}]