Question: what is the starting point of the mississippi river
[{'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.'}]}, {'provenance': [{'wikipedia_id': '19579', 'title': 'Mississippi River', 'start_paragraph_id': 15, 'start_character': 0, 'end_paragraph_id': 15, 'end_character': 447, 'bleu_score': 0.9087701224825541, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 242157609119788970}, 'section': 'Section::::Divisions.:Upper Mississippi.\n'}]}]