Final answer:
The effect of prolactin closely interacts with b)oxytocin, aiding in milk production and ejection during breastfeeding. Growth hormone, along with other hormones, also contributes to lactation by facilitating nutrient transport to breast milk.
Step-by-step explanation:
The effect of prolactin closely interacts with several other hormones, but most notably with oxytocin. While prolactin is responsible for the production of milk by the mammary glands after childbirth, oxytocin triggers the milk ejection reflex or 'let-down' during breastfeeding. In addition to prolactin and oxytocin, other hormones such as growth hormone, cortisol, parathyroid hormone, and insulin also contribute to lactation. These hormones cooperate to ensure that adequate nutrients are transported to the breast milk.Therefore, the correct answer is option b)Oxytocin.