Question: when does big air start in the olympics
[{'answer': '21 and 24 February 2018', 'provenance': [{'wikipedia_id': '56223736', 'title': "Snowboarding at the 2018 Winter Olympics – Men's big air", 'start_paragraph_id': 1, 'start_character': 70, 'end_paragraph_id': 1, 'end_character': 93, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '56223736', 'title': "Snowboarding at the 2018 Winter Olympics – Men's big air", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 197, 'bleu_score': 0.9451524926983921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2120842004042561015}, 'section': 'Section::::Abstract.'}]}]