This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anaesthesia For Special Situations, Subject name: Anaesthesia
The drug for OPD analgesia is- 
Select and explain. 
A. Morphine, B. Pethidine, C. Fentanyl, D. Alfentanil
D: Alfentanil
Answer: D: Alfentanil 
Explanation: Ans. is 'd' i.e., AlfentanilDrugs useful for day care surgeryo Propofolo Sevoflurane, desflurane & isofluraneo Alfantanilo Midazolamo Mivacurium