This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Intravenous Anesthetic Agents, Subject name: Anaesthesia
All of the following can be routes of opioid administration except: 
Select and explain. 
A. Intravenous, B. Intramuscular, C. Oral, D. Intradermal
D: Intradermal
Answer: D: Intradermal 
Explanation: Opioid can be given intravenous, intramuscular, transdermal, oral , intrathecal , epidural . Opioid patch can be applied which is transdermal route.