This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2017, Subject name: Pharmacology
All of the following are actions produced by mu receptors of morphine except:- 
Select and explain. 
A. Miosis, B. Decreased GI motility, C. Respiratory depression, D. Hyperalgesia
D: Hyperalgesia
Answer: D: Hyperalgesia 
Explanation: Actions by u(MU) receptors S sedation A analgesia C constipation R respiratory depression U euphoria M miosis u (Mu) receptors cause analgesia and not hyperalgesia (Increase sensation of pain)