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: Anaesthesia
Which of the following is not primarily used to anesthetize mucosa ? 
Select and explain. 
A. Benzocaine, B. Lidocaine, C. Bupivacain, D. Tetracaine
C: Bupivacain
Answer: C: Bupivacain 
Explanation: Ans. is 'c' i.e., Bupivacaine