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: Anaesthesia
During surgery for aortic arch aneurysm under deep hypothermic circulatory arrest, which of the following anesthetic agent administered prior to circulatory arrest that also provides cerebral protection ? 
Select and explain. 
A. Etomidate, B. Thiopental sodium, C. Propofol, D. Ketamine
B: Thiopental sodium
Answer: B: Thiopental sodium 
Explanation: Thiopental, etomidate and propofol, all three are cerebroprotective. However, thiopental has maximum cerebroprotective action.
"Propofol and etomidate appear to lack the same protective effects as thiopental in focal cerebral ischemia"   ─ Morgan