Question: which one is the largest district in kerala
[{'answer': 'Palakkad', 'provenance': [{'wikipedia_id': '2318726', 'title': 'List of districts in Kerala', 'start_paragraph_id': 1, 'start_character': 225, 'end_paragraph_id': 1, 'end_character': 233, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]