Question: what was the first sign that mt. pinatubo had awoken
[{'answer': 'March 15 , 1991', 'provenance': [{'wikipedia_id': '500560', 'title': 'Mount Pinatubo', 'start_paragraph_id': 33, 'start_character': 3, 'end_paragraph_id': 33, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::History.:Modern Pinatubo.:1991 activities leading to the eruption.\n'}]}, {'provenance': [{'wikipedia_id': '500560', 'title': 'Mount Pinatubo', 'start_paragraph_id': 33, 'start_character': 0, 'end_paragraph_id': 33, 'end_character': 517, 'bleu_score': 0.9130050572547871, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6925972178795309942}, 'section': 'Section::::History.:Modern Pinatubo.:1991 activities leading to the eruption.\n'}]}]