This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
Shoest acting synthetic opioid is 
Select and explain. 
A. Fentanyl, B. Remifentanil, C. Alfentanil, D. Sufentanil
B: Remifentanil
Answer: B: Remifentanil 
Explanation: .Remifentanil is a potent, sho-acting synthetic opioid analgesic drug. It is given to patients during surgery to relieve pain and as an adjunct to an anaesthetic. Remifentanil is used for sedation as well as combined with other medications for use in general anesthesia Ref Robbins 9/e pg 345