Question: how many versions of mario kart are there
[{'answer': 'thirteen'}, {'provenance': [{'wikipedia_id': '19680', 'title': 'Mario Kart', 'start_paragraph_id': 1, 'start_character': 73, 'end_paragraph_id': 1, 'end_character': 399, 'bleu_score': 0.537808549714139, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13952755444221714011}, 'section': 'Section::::Abstract.'}]}]