Question: how many episodes in season 5 of soa
[{'answer': '13', 'provenance': [{'wikipedia_id': '34642983', 'title': 'Sons of Anarchy (season 5)', 'start_paragraph_id': 1, 'start_character': 147, 'end_paragraph_id': 1, 'end_character': 149, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]