Question: how many types of skin color are there
[{'answer': 'VI', 'provenance': [{'wikipedia_id': '38041', 'title': 'Human skin color', 'start_paragraph_id': 1, 'start_character': 87, 'end_paragraph_id': 1, 'end_character': 89, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]