Question: how many episodes are there in originals season 4
[{'answer': '13', 'provenance': [{'wikipedia_id': '50904526', 'title': 'The Originals (season 4)', 'start_paragraph_id': 1, 'start_character': 343, 'end_paragraph_id': 1, 'end_character': 345, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]