Question: where is the placenta attached to the mother
[{'answer': 'wall of the uterus', 'provenance': [{'wikipedia_id': '67166', 'title': 'Placenta', 'start_paragraph_id': 26, 'start_character': 66, 'end_paragraph_id': 26, 'end_character': 84, 'bleu_score': 1.0, 'section': 'Section::::Physiology.:Birth.\n'}]}]