This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Regional anaesthesia, Subject name: Anaesthesia
[{'content': 'Which of the following anesthetize mucosa is snot Primarily used anesthetize mucosa \nSelect and explain. \nA. Benzocaine, B. Lidocaine, C. Bupivacaine, D. Tetracaine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Bupivacaine cannot be used as surface anesthetic agent Bupivacaine is contraindicated in intravenous regional anesthesia due to fear of cardiac arrhythmia', 'role': 'assistant'}]