Question: how many episodes are in van helsing season 2
[{'answer': '13', 'provenance': [{'wikipedia_id': '49465718', 'title': 'Van Helsing (TV series)', 'start_paragraph_id': 1, 'start_character': 333, 'end_paragraph_id': 1, 'end_character': 335, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]