Which part of the breast contains the milk-producing structures?

The lobule is the correct answer because it is the part of the breast that comprises the glands responsible for milk production. In females, the breast contains a network of lobules that are connected to the larger ducts and are critical for lactation. Each lobule contains alveoli, which are small sacs where milk is produced in response to hormonal signals, particularly during pregnancy and breastfeeding.

Understanding the anatomy of the breast is essential for mammography, as knowledge of the lobular structure helps radiologists identify normal from abnormal findings in breast imaging. The lobules are interconnected with ducts that transport the milk towards the nipple, facilitating breastfeeding.

Other options, such as the ductal region, stroma, and fatty tissue, serve different functions in breast anatomy. The ductal region is significant for milk transport, the stroma is the connective tissue providing support, and fatty tissue helps determine the overall shape and density of the breast but does not contribute to milk production. Thus, the presence of lobules is specifically tied to the milk-producing capability of breast tissue.