Question: how many cities in india have metro railway
[{'answer': 'ten', 'provenance': [{'wikipedia_id': '26005906', 'title': 'Urban rail transit in India', 'start_paragraph_id': 30, 'start_character': 155, 'end_paragraph_id': 30, 'end_character': 158, 'bleu_score': 1.0, 'section': 'Section::::Light rail.\n'}]}, {'provenance': [{'wikipedia_id': '26005906', 'title': 'Urban rail transit in India', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 479, 'bleu_score': 0.785640014161292, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14532491571737786432}, 'section': 'Section::::Rapid transit (metro).\n'}]}]