Question: when do doug and carol get married in er
[{'answer': 'Season 15', 'provenance': [{'wikipedia_id': '3836832', 'title': 'Carol Hathaway', 'start_paragraph_id': 20, 'start_character': 11, 'end_paragraph_id': 20, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Season 14.\n'}]}, {'provenance': [{'wikipedia_id': '3836832', 'title': 'Carol Hathaway', 'start_paragraph_id': 22, 'start_character': 0, 'end_paragraph_id': 22, 'end_character': 558, 'bleu_score': 0.9516391630120881, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17042113432404024291}, 'section': 'Section::::Season 15.\n'}]}]