Question: what is the most current season of supernatural
[{'answer': 'season 13', 'provenance': [{'wikipedia_id': '54184235', 'title': 'Supernatural (season 13)', 'start_paragraph_id': 0, 'start_character': 14, 'end_paragraph_id': 0, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]