Question: when did delhi become the capital of british india
[{'answer': '1911', 'provenance': [{'wikipedia_id': '37756', 'title': 'Delhi', 'start_paragraph_id': 25, 'start_character': 258, 'end_paragraph_id': 25, 'end_character': 262, 'bleu_score': 1.0, 'section': 'Section::::History.:Colonial Period.\n'}]}]