Question: the world famous corn belt is in which country
[{'answer': 'the United States', 'provenance': [{'wikipedia_id': '478009', 'title': 'Corn Belt', 'start_paragraph_id': 1, 'start_character': 114, 'end_paragraph_id': 1, 'end_character': 131, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'United States', 'provenance': [{'wikipedia_id': '478009', 'title': 'Corn Belt', 'start_paragraph_id': 1, 'start_character': 44, 'end_paragraph_id': 1, 'end_character': 57, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '478009', 'title': 'Corn Belt', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 233, 'bleu_score': 0.7062726573253381, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 254656158596883283}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '478009', 'title': 'Corn Belt', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The Corn Belt is a region of the Midwestern United States that, since the 1850s, has dominated corn production in the United States. More generally, the concept of the "Corn Belt" connotes the area of the Midwest dominated by farming and agriculture.', 'The Corn Belt is a region of the Midwestern United States', 'The Corn Belt is a region of the Midwestern United States']}}]}]