Question: placenta develops from the outer cells of the
[{'answer': 'trophoblast', 'provenance': [{'wikipedia_id': '67166', 'title': 'Placenta', 'start_paragraph_id': 10, 'start_character': 318, 'end_paragraph_id': 10, 'end_character': 329, 'bleu_score': 1.0, 'section': 'Section::::Structure.:Gene and protein expression.\n'}]}, {'provenance': [{'wikipedia_id': '67166', 'title': 'Placenta', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 710, 'bleu_score': 0.980097014099621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6109602698370015394}, 'section': 'Section::::Physiology.:Development.\n'}]}]