Question: what is the purpose of a grain silo
[{'answer': 'for bulk storage of grain', 'provenance': [{'wikipedia_id': '3246948', 'title': 'Silo', 'start_paragraph_id': 1, 'start_character': 239, 'end_paragraph_id': 1, 'end_character': 264, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3246948', 'title': 'Silo', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 422, 'bleu_score': 0.9716239638199891, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2315993974393466533}, 'section': 'Section::::Abstract.'}]}]