This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET Jan 2020, Subject name: Physiology
[{'content': 'Serum prolactin levels are highest \nSelect and explain. \nA. REM sleep, B. 24 hrs after paurition, C. 1 hr after running, D. When Estrogens are high', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Normaladult serum PRL levels are about10-25 mg/Linwomenand10-20 mg/L in men. PRL secretion is pulsatile, with the highest secretory peaks occurring during rapid eye movement sleep. Peak serum PRL levels (up to 30 mg/L) occur between 4:00 and 6:00 a.m. The circulating half-life of PRL is about 50 min.', 'role': 'assistant'}]