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
Allergic reactions in patients who receive amide-type local anesthetics for dental procedures are most likely caused by reaction of 
Select and explain. 
A. Methylparaben, B. Contaminants, C. Lignocaine hydrochloride, D. Epinephrine
A: Methylparaben
Answer: A: Methylparaben 
Explanation: None