Question: when did ac milan last win the italian serie a title
[{'answer': '18', 'provenance': [{'wikipedia_id': '8136571', 'title': 'List of A.C. Milan records and statistics', 'start_paragraph_id': 1, 'start_character': 154, 'end_paragraph_id': 1, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]