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: Anaesthesia
True about epidural narcotics (opioids) are all except 
Select and explain. 
A. Nausea, vomiting (gi side effects), B. Pruritis (itching), C. Respiratory depression, D. Act on dorsal horn cells
D: Act on dorsal horn cells
Answer: D: Act on dorsal horn cells 
Explanation: D i.e. Act on dorsal horn cells