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: Surgery
Which of the following can be used as local anesthetic agent for infiltration if a patient is allergic to amide and ester anaesthetic derivatives 
Select and explain. 
A. Nitrous oxide, B. Bupivacaine, C. Phenylephrine, D. Diphenhydramine
D: Diphenhydramine
Answer: D: Diphenhydramine 
Explanation: None