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': 'Breast develop due to action of \nSelect and explain. \nA. Progesteron, B. Oestrogen, C. Activin, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The breast is one of two prominences located on the upper ventral region of the torso of female primates. In females, it serves as the mammary gland, which produces and secretes milk and feeds infants. Both females and males develop breasts from the same embryological tissues. At pubey, estrogens, in conjunction with growth hormone, cause breast development.', 'role': 'assistant'}]