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
Increased Cardiac Oxygen demand is caused by 
Select and explain. 
A. Halothane, B. Thiopentone, C. N20, D. Ketamine
D: Ketamine
Answer: D: Ketamine 
Explanation: D i.e. Ketamine