Question: how many episodes were in season 2 of friday night lights
[{'answer': '15', 'provenance': [{'wikipedia_id': '13825162', 'title': 'Friday Night Lights (season 2)', 'start_paragraph_id': 1, 'start_character': 173, 'end_paragraph_id': 1, 'end_character': 175, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]