Question: how many episodes of oak island are there in season 5
[{'answer': '18', 'provenance': [{'wikipedia_id': '41545066', 'title': 'The Curse of Oak Island', 'start_paragraph_id': 9, 'start_character': 349, 'end_paragraph_id': 9, 'end_character': 351, 'bleu_score': 1.0, 'section': 'Section::::Production.\n'}]}]