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
No effect on hea 
Select and explain. 
A. Chloroform, B. Ether, C. Methoxyflurane, D. Halothane
B: Ether
Answer: B: Ether 
Explanation: B i.e. Ether