Question: which river begins in central africa near lake tanganyika
[{'answer': 'the Congo', 'provenance': [{'wikipedia_id': '44361', 'title': 'Congo River', 'start_paragraph_id': 2, 'start_character': 196, 'end_paragraph_id': 2, 'end_character': 205, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '44361', 'title': 'Congo River', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 383, 'bleu_score': 0.970795021215021, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11576509105635000920}, 'section': 'Section::::Basin and course.\n'}]}]