This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Central Nervous system, Subject name: Pharmacology
[{'content': 'Dysphoria caused by opiates is mediated by which recetor? \nSelect and explain. \nA. mu, B. Kappa, C. Delta, D. Sigma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref: KDT 7/e p79 Dysphoria and psychomimetics effects are caused by kappa receptors.', 'role': 'assistant'}]