Question: what is the main train station in milan
[{'answer': 'Milan Central'}, {'provenance': [{'wikipedia_id': '247393', 'title': 'Milano Centrale railway station', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 462, 'bleu_score': 0.8421085754130121, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17811107556016186051}, 'section': 'Section::::Abstract.'}]}]