Question: which is the zonal headquaters of south western railway
[{'answer': 'Hubli', 'provenance': [{'wikipedia_id': '2061305', 'title': 'South Western Railway zone', 'start_paragraph_id': 8, 'start_character': 81, 'end_paragraph_id': 8, 'end_character': 86, 'bleu_score': 1.0, 'section': 'Section::::Development.\n'}]}, {'answer': 'Mysore', 'provenance': [{'wikipedia_id': '2061305', 'title': 'South Western Railway zone', 'start_paragraph_id': 8, 'start_character': 30, 'end_paragraph_id': 8, 'end_character': 36, 'bleu_score': 1.0, 'section': 'Section::::Development.\n'}]}, {'answer': 'Bangalore', 'provenance': [{'wikipedia_id': '2061305', 'title': 'South Western Railway zone', 'start_paragraph_id': 8, 'start_character': 20, 'end_paragraph_id': 8, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::Development.\n'}]}]