This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia, Subject name: Pharmacology
Anaesthetic agent causing pain on intravenous administration 
Select and explain. 
A. Thiopentone, B. Propofol, C. Ketamine, D. Midazolam
B: Propofol
Answer: B: Propofol 
Explanation: Refer Katzung 12th/431 Propofol is highly lipid soluble It's solution is made in oil(oliy liquid employed as 1 percnt emulsion) Thus it is painful on injection