Question: when was the battle of panipat 1 fought
[{'answer': '21 April 1526', 'provenance': [{'wikipedia_id': '282411', 'title': 'First Battle of Panipat', 'start_paragraph_id': 1, 'start_character': 32, 'end_paragraph_id': 1, 'end_character': 45, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '282411', 'title': 'First Battle of Panipat', 'start_paragraph_id': 1, 'start_character': 4, 'end_paragraph_id': 1, 'end_character': 388, 'bleu_score': 0.870895348208884, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1212520958519408210}, 'section': 'Section::::Abstract.'}]}]