Question: who made the engine for the p 51 mustang
[{'answer': 'Allison', 'provenance': [{'wikipedia_id': '24710', 'title': 'North American P-51 Mustang', 'start_paragraph_id': 2, 'start_character': 36, 'end_paragraph_id': 2, 'end_character': 43, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Rolls - Royce', 'provenance': [{'wikipedia_id': '24710', 'title': 'North American P-51 Mustang', 'start_paragraph_id': 26, 'start_character': 329, 'end_paragraph_id': 26, 'end_character': 341, 'bleu_score': 1.0, 'section': 'Section::::Operational history.:U.S. operational service.:P-51 introduction.\n'}]}, {'answer': 'Packard', 'provenance': [{'wikipedia_id': '24710', 'title': 'North American P-51 Mustang', 'start_paragraph_id': 2, 'start_character': 568, 'end_paragraph_id': 2, 'end_character': 575, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '24710', 'title': 'North American P-51 Mustang', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 733, 'bleu_score': 0.613651032502846, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7312866406053709402}, 'section': 'Section::::Abstract.'}]}]