Question: when was the first metro train started in delhi
[{'answer': '2002', 'provenance': [{'wikipedia_id': '30874055', 'title': 'Delhi Metro', 'start_paragraph_id': 3, 'start_character': 123, 'end_paragraph_id': 3, 'end_character': 127, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '30874055', 'title': 'Delhi Metro', 'start_paragraph_id': 12, 'start_character': 15, 'end_paragraph_id': 12, 'end_character': 610, 'bleu_score': 0.8381398487482311, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15256101445122433393}, 'section': 'Section::::History.:Initial Construction.\n'}]}]