Question: why type of volcano is mount saint helens
[{'answer': 'an active stratovolcano', 'provenance': [{'wikipedia_id': '36649', 'title': 'Mount St. Helens', 'start_paragraph_id': 1, 'start_character': 123, 'end_paragraph_id': 1, 'end_character': 146, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '36649', 'title': 'Mount St. Helens', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 722, 'bleu_score': 0.8463841903447601, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9827539220345977857}, 'section': 'Section::::Abstract.'}]}]