Question: how many episodes are in the second season of pretty little liars
[{'answer': '25', 'provenance': [{'wikipedia_id': '31262738', 'title': 'Pretty Little Liars (season 2)', 'start_paragraph_id': 61, 'start_character': 218, 'end_paragraph_id': 61, 'end_character': 220, 'bleu_score': 1.0, 'section': 'Section::::Development and production.\n'}]}]