Question: in which countries is the great rift valley located
[{'answer': 'Asia', 'provenance': [{'wikipedia_id': '12800', 'title': 'Great Rift Valley', 'start_paragraph_id': 1, 'start_character': 146, 'end_paragraph_id': 1, 'end_character': 150, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Africa', 'provenance': [{'wikipedia_id': '12800', 'title': 'Great Rift Valley', 'start_paragraph_id': 1, 'start_character': 181, 'end_paragraph_id': 1, 'end_character': 187, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]