Question: when was call the midwife first shown on tv
[{'answer': 'on 15 January 2012', 'provenance': [{'wikipedia_id': '34388493', 'title': 'Call the Midwife', 'start_paragraph_id': 1, 'start_character': 711, 'end_paragraph_id': 1, 'end_character': 729, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '34388493', 'title': 'Call the Midwife', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 729, 'bleu_score': 0.9831208473513011, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5255223462258697207}, 'section': 'Section::::Abstract.'}]}]