Question: what are the headwaters of the mississippi river
[{'answer': 'Lake Itasca in northern Minnesota', 'provenance': [{'wikipedia_id': '19579', 'title': 'Mississippi River', 'start_paragraph_id': 1, 'start_character': 198, 'end_paragraph_id': 1, 'end_character': 231, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19579', 'title': 'Mississippi River', 'start_paragraph_id': 1, 'start_character': 44, 'end_paragraph_id': 1, 'end_character': 873, 'bleu_score': 0.7684397774919961, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16463455981169028298}, 'section': 'Section::::Abstract.'}]}]