Question: how many national parks are there in tanzania
[{'answer': '16', 'provenance': [{'wikipedia_id': '11132430', 'title': 'List of protected areas of Tanzania', 'start_paragraph_id': 4, 'start_character': 4, 'end_paragraph_id': 4, 'end_character': 6, 'bleu_score': 1.0, 'section': 'Section::::National parks.\n'}]}, {'provenance': [{'wikipedia_id': '11132430', 'title': 'List of protected areas of Tanzania', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 235, 'bleu_score': 0.948006874591591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11805724228613611547}, 'section': 'Section::::National parks.\n'}]}]