Question: who ruled during the golden age of the abbasid caliphate
[{'answer': 'Harun al - Rashid', 'provenance': [{'wikipedia_id': '37477763', 'title': 'Islamic Golden Age', 'start_paragraph_id': 5, 'start_character': 977, 'end_paragraph_id': 5, 'end_character': 1001, 'bleu_score': 1.0, 'section': 'Section::::History of the concepts.\n'}]}, {'provenance': [{'wikipedia_id': '37477763', 'title': 'Islamic Golden Age', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 801, 'bleu_score': 0.8057556618675541, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1700917713577624562}, 'section': 'Section::::Abstract.'}]}]