This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology metabolism, Subject name: Physiology
[{'content': 'Prolactin secretion is not stimulated by: \nSelect and explain. \nA. Levodopa, B. Sleep, C. Estrogen, D. Pregnancy', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. A LevodopaRef: Ganong's, 23rd ed. pg. 333Factors affecting Prolactin secretionIncrease prolactinDecrease prolactin* Sleep* Pregnancy; Estrogen* Opioids* TRH* Phenothiazines* L-Dopa* Apomorphine* Bromocriptine related ergot derivative", 'role': 'assistant'}]