Question: how many episodes are there in stranger things season 2
[{'answer': 'nine', 'provenance': [{'wikipedia_id': '46301800', 'title': 'Stranger Things', 'start_paragraph_id': 4, 'start_character': 255, 'end_paragraph_id': 4, 'end_character': 259, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]