Question: who won the last open at royal birkdale
[{'answer': 'Jordan Spieth', 'provenance': [{'wikipedia_id': '1560753', 'title': 'Royal Birkdale Golf Club', 'start_paragraph_id': 1, 'start_character': 461, 'end_paragraph_id': 1, 'end_character': 474, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]