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
Cerebral metabolism and 02 consumption are increased by: 
Select and explain. 
A. Propofol, B. Ketamine, C. Atracurium, D. Fentanyl
B: Ketamine
Answer: B: Ketamine 
Explanation: B i.e. Ketamine