This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Anaesthesia
All of the following decreases cerebral blood now, and intracninial pressure except: 
Select and explain. 
A. Propofol, B. Thiopentone, C. Ketamine, D. Etomidate
C: Ketamine
Answer: C: Ketamine 
Explanation: (C) Ketamine