Question: who has scored a hat trick of headers
[{'answer': 'Duncan Ferguson', 'provenance': [{'wikipedia_id': '20989220', 'title': 'List of Premier League hat-tricks', 'start_paragraph_id': 2, 'start_character': 595, 'end_paragraph_id': 2, 'end_character': 610, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Salomón Rondón', 'provenance': [{'wikipedia_id': '20989220', 'title': 'List of Premier League hat-tricks', 'start_paragraph_id': 2, 'start_character': 615, 'end_paragraph_id': 2, 'end_character': 629, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20989220', 'title': 'List of Premier League hat-tricks', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 727, 'bleu_score': 0.9383797420612221, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3039153121096897800}, 'section': 'Section::::Abstract.'}]}]