Question: who sings it's hard out here for a pimp
[{'answer': 'Three 6 Mafia', 'provenance': [{'wikipedia_id': '4293529', 'title': "It's Hard out Here for a Pimp", 'start_paragraph_id': 2, 'start_character': 67, 'end_paragraph_id': 2, 'end_character': 80, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]