Question: which is the nearest railway station from chennai airport
[{'answer': 'Tirusulam railway station', 'provenance': [{'wikipedia_id': '37802631', 'title': 'Tirusulam railway station', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 25, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '37802631', 'title': 'Tirusulam railway station', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 386, 'bleu_score': 0.8711504269122821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17855394734771181739}, 'section': 'Section::::Abstract.'}]}]