Question: lobulo-alveolar structure in the breast is caused by
[{'answer': 'progesterone', 'provenance': [{'wikipedia_id': '24385806', 'title': 'Breast development', 'start_paragraph_id': 1, 'start_character': 561, 'end_paragraph_id': 1, 'end_character': 573, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '24385806', 'title': 'Breast development', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 1647, 'bleu_score': 0.9541180762594521, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 204903489844244941}, 'section': 'Section::::Biochemistry.:Hormones.\n'}]}]