This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Prolactin: \nSelect and explain. \nA. Has somatotropic activity., B. It flow can cause infertility in women., C. Can suppress menstrual cycle in lactating women., D. Levels are increased by dopamine.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Prolactin, though structurally related to growth hormone does not share its somatotropic activity. Dopamine binds to the lactotropes and inhibits the synthesis and release of prolactin. Hyperprolactinemia suppresses the hypothalamic-pituitary-gonadal axis, causes infertility in women and suppresses the normal menstrual cycle in lactating women.', 'role': 'assistant'}]