Which hormone helps in the production of breast milk during pregnancy?

Human placental lactogen (hPL), also known as human chorionic somatomammotropin, plays a crucial role in preparing the breasts for lactation during pregnancy. Produced by the placenta, hPL works by promoting the growth and development of mammary glands, which is essential for milk production. It helps to ensure that the breast tissue is ready to produce milk after childbirth.

As pregnancy progresses, hPL helps to facilitate the changes in breast tissue, making it more conducive for milk production when the time comes to breastfeed. This hormone acts by mimicking some aspects of growth hormone and has lactogenic properties that aid in the overall process of lactation.

In summary, hPL is specifically important for the production of breast milk during pregnancy by stimulating breast tissue development, making it the correct choice for this question.