Question: when did the field of obstetrics first emerge in the field of medicine
[{'answer': 'By the late 19th century', 'provenance': [{'wikipedia_id': '52965', 'title': 'Obstetrics', 'start_paragraph_id': 96, 'start_character': 0, 'end_paragraph_id': 96, 'end_character': 24, 'bleu_score': 1.0, 'section': 'Section::::History.:19th century.\n'}]}, {'provenance': [{'wikipedia_id': '52965', 'title': 'Obstetrics', 'start_paragraph_id': 96, 'start_character': 0, 'end_paragraph_id': 96, 'end_character': 531, 'bleu_score': 0.9757530668325981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3537181774769542791}, 'section': 'Section::::History.:19th century.\n'}]}]