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
Which of the following anaesthetic agents has the least analgesic effect? 
Select and explain. 
A. N2O, B. Ether, C. Halothane, D. Cyclopropane
C: Halothane
Answer: C: Halothane 
Explanation: N2O is a potent analgesic but not a potent anesthetic. Halothane is a good anaesthetic but poor analgesic.