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: Physiology
Vasopressin is secreted by: 
Select and explain. 
A. Supraoptic  nucleus, B. Preoptic nucleus, C. Paraventricular nucleus, D. Posterior nucleus
A: Supraoptic  nucleus
Answer: A: Supraoptic  nucleus 
Explanation: ADH (vasopressin) is secreted by supraoptic nucleus.
Oxytocin is secreted by paraventricular nucleus.