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
Dysphoria caused by opiates is mediated by which recetor? 
Select and explain. 
A. mu, B. Kappa, C. Delta, D. Sigma
B: Kappa
Answer: B: Kappa 
Explanation: Ref: KDT 7/e p79 Dysphoria and psychomimetics effects are caused by kappa receptors.