Question: who is the youngest coach in nfl history
[{'answer': 'Sean McVay', 'provenance': [{'wikipedia_id': '23121362', 'title': 'Sean McVay', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 10, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23121362', 'title': 'Sean McVay', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 254, 'bleu_score': 0.9042878500265971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6915225314899522840}, 'section': 'Section::::Abstract.'}]}]