Question: which is the largest district in uttarakhand according to the area
[{'answer': 'Chamoli', 'provenance': [{'wikipedia_id': '3448801', 'title': 'List of districts of Uttarakhand', 'start_paragraph_id': 18, 'start_character': 27, 'end_paragraph_id': 18, 'end_character': 34, 'bleu_score': 1.0, 'section': 'Section::::Popular demand for other districts.\n'}]}]