Question: which province has the smallest population in south africa
[{'answer': 'Northern Cape', 'provenance': [{'wikipedia_id': '1860425', 'title': 'List of South African provinces by population density', 'start_paragraph_id': 1, 'start_character': 228, 'end_paragraph_id': 1, 'end_character': 241, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]