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
Profound analgesia is produced by which parenteral anaesthetic ? 
Select and explain. 
A. Thiopental, B. Propofol, C. Ketamine, D. Etomidate
C: Ketamine
Answer: C: Ketamine 
Explanation: None