Question: who used the term rock n roll on the radio for the first time
[{'answer': 'Alan Freed', 'provenance': [{'wikipedia_id': '944646', 'title': 'Origins of rock and roll', 'start_paragraph_id': 2, 'start_character': 503, 'end_paragraph_id': 2, 'end_character': 513, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '944646', 'title': 'Origins of rock and roll', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 603, 'bleu_score': 0.9139788185540361, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15284692564145930787}, 'section': 'Section::::Abstract.'}]}]