Question: how many episodes does riverdale season 2 have
[{'answer': '22', 'provenance': [{'wikipedia_id': '49281386', 'title': 'Riverdale (2017 TV series)', 'start_paragraph_id': 3, 'start_character': 209, 'end_paragraph_id': 3, 'end_character': 211, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]