Question: when was first metro train started in world
[{'answer': '1890', 'provenance': [{'wikipedia_id': '31945', 'title': 'List of metro systems', 'start_paragraph_id': 1, 'start_character': 423, 'end_paragraph_id': 1, 'end_character': 427, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31945', 'title': 'List of metro systems', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 643, 'bleu_score': 0.8086774741938041, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6983234651160814340}, 'section': 'Section::::Abstract.'}]}]