Question: who is the largest tractor manufacturer in the world
[{'answer': 'Mahindra Tractors', 'provenance': [{'wikipedia_id': '12553516', 'title': 'Mahindra Tractors', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 17, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12553516', 'title': 'Mahindra Tractors', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 373, 'bleu_score': 0.9663744727315161, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5116473160008420930}, 'section': 'Section::::Abstract.'}]}]