Question: where does the lowest amount of rainfall in africa occur
[{'answer': 'The Sahara Desert', 'provenance': [{'wikipedia_id': '30882307', 'title': 'Climate of Africa', 'start_paragraph_id': 9, 'start_character': 171, 'end_paragraph_id': 9, 'end_character': 188, 'bleu_score': 1.0, 'section': 'Section::::Precipitation.\n'}]}, {'provenance': [{'wikipedia_id': '30882307', 'title': 'Climate of Africa', 'start_paragraph_id': 9, 'start_character': 0, 'end_paragraph_id': 9, 'end_character': 1122, 'bleu_score': 0.9240811795797781, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10580721643258461429}, 'section': 'Section::::Precipitation.\n'}]}]