Question: which is the deepest lake in east africa
[{'answer': 'Lake Tanganyika', 'provenance': [{'wikipedia_id': '169713', 'title': 'Lake Tanganyika', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '169713', 'title': 'Lake Tanganyika', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 507, 'bleu_score': 0.9587895747539651, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13117829414106998396}, 'section': 'Section::::Abstract.'}]}]