Question: season 2 this is us number of episodes
[{'answer': '18', 'provenance': [{'wikipedia_id': '55143891', 'title': 'This Is Us (season 2)', 'start_paragraph_id': 3, 'start_character': 33, 'end_paragraph_id': 3, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '13', 'provenance': [{'wikipedia_id': '55143891', 'title': 'This Is Us (season 2)', 'start_paragraph_id': 3, 'start_character': 86, 'end_paragraph_id': 3, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '15'}, {'provenance': [{'wikipedia_id': '55143891', 'title': 'This Is Us (season 2)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 183, 'bleu_score': 0.631477648074336, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16418136572046084868}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '55143891', 'title': 'This Is Us (season 2)', 'section': 'Section::::Abstract.', 'start_paragraph_id': 3, 'end_paragraph_id': 3, 'meta': {'evidence_span': ['18', 'The second season, consisting of 18 episodes, aired from September 26, 2017, to March 13, 2018, on NBC.']}}]}]