This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anaesthesia
Pain during injection occurs with all Except 
Select and explain. 
A. Propofol, B. Thiopentone, C. Ketamine, D. Etomidate
C: Ketamine
Answer: C: Ketamine 
Explanation: Ketamine is the only intravenous inducing agent that does not cause pain on injectionAgentPain on iv injectionThiopentoneMethohexitonePropofolEtomidateKetamine+/0++++++0