This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Physiology
[{'content': 'Vasopressin is secreted by \nSelect and explain. \nA. Supraoptic, B. Preoptic, C. Paraventricular, D. Posterior nucleus', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Supraoptic nucleus (nucleus supraopticus) one just above the lateral pa of the optic chiasm; many of its cells are neurosecretory in function and project to the neurohypophysis, where they secrete antidiuretic hormone (ADH) and, to a lesser extent, oxytocin; other cells are osmoreceptors that stimulate ADH release in response to increased osmotic pressure.Ref: Ganong&;s review of medical physiology; 24th edition;', 'role': 'assistant'}]