Question: who was the song you're so vain based on
[{'answer': 'Warren Beatty', 'provenance': [{'wikipedia_id': '609802', 'title': "You're So Vain", 'start_paragraph_id': 1, 'start_character': 400, 'end_paragraph_id': 1, 'end_character': 413, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'the song refers to three men'}, {'provenance': [{'wikipedia_id': '609802', 'title': "You're So Vain", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 413, 'bleu_score': 0.5880122945067641, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 281628243124238453}, 'section': 'Section::::Abstract.'}]}]