This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
[{'content': 'In breast lactiferous ducts are formed under the influence of which hormone? \nSelect and explain. \nA. Estrogen, B. Progesterone, C. LH, D. FSH', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lactiferous ducts are one of the ducts, numbering 15-20, which drain the lobes of the mammary gland; they open at the nipple.Ref: Ganong&;s review of medical physiology; 24th edition; page no: 416', 'role': 'assistant'}]