Question: who sings i wanna be a billionaire
[{'answer': 'Bruno Mars', 'provenance': [{'wikipedia_id': '27037324', 'title': 'Billionaire (song)', 'start_paragraph_id': 1, 'start_character': 153, 'end_paragraph_id': 1, 'end_character': 163, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '27037324', 'title': 'Billionaire (song)', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 740, 'bleu_score': 0.520467242646524, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4117064599907915540}, 'section': 'Section::::Background and development.\n'}]}]