Question: how many episodes are there in the walking dead season 2
[{'answer': '13 episodes', 'provenance': [{'wikipedia_id': '30876562', 'title': 'The Walking Dead (season 2)', 'start_paragraph_id': 1, 'start_character': 181, 'end_paragraph_id': 1, 'end_character': 192, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '30876562', 'title': 'The Walking Dead (season 2)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 531, 'bleu_score': 0.946458428441119, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12391779182473482633}, 'section': 'Section::::Abstract.'}]}]