Question: where does the mississippi river start in minnesota
[{'answer': 'Lake Itasca', 'provenance': [{'wikipedia_id': '19579', 'title': 'Mississippi River', 'start_paragraph_id': 1, 'start_character': 198, 'end_paragraph_id': 1, 'end_character': 209, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]