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 is not a content of plane LA 
Select and explain. 
A. Methyl paraben, B. Epinephrine, C. Nacl, D. Lignocaine
B: Epinephrine
Answer: B: Epinephrine 
Explanation: None