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
All of the following are true about opioids except ? 
Select and explain. 
A. Naloxone is short acting, B. Naltrexone is used to lower craving in alcoholics, C. Nalmefene can be used for opioid poisoning, D. Nalmefene is shorter acting than naloxone
D: Nalmefene is shorter acting than naloxone
Answer: D: Nalmefene is shorter acting than naloxone 
Explanation: None