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': 'Which of the following receptors mediate the release of ACTH by Vasopressin? \nSelect and explain. \nA. V1a, B. V2, C. V3, D. V4', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vasopressin acts on V3\xa0or V1b\xa0receptors to release ACTH.', 'role': 'assistant'}]