Question: into what body of water does the mississippi river system empty
[{'answer': 'Gulf of Mexico', 'provenance': [{'wikipedia_id': '19579', 'title': 'Mississippi River', 'start_paragraph_id': 1, 'start_character': 303, 'end_paragraph_id': 1, 'end_character': 317, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19579', 'title': 'Mississippi River', 'start_paragraph_id': 1, 'start_character': 50, 'end_paragraph_id': 1, 'end_character': 873, 'bleu_score': 0.752361749784142, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 182446259340042230}, 'section': 'Section::::Abstract.'}]}]