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
About lidocaine, all are true except - 
Select and explain. 
A. LA effect, B. Cardiac arrhythmia, C. Ester, D. Acts on mucous membranes
C: Ester
Answer: C: Ester 
Explanation: lidocaine is amide linked local anaesthetic It can be used as surface anesthetic agent through skin and mucucous membrane lidocaine is an antiarrhythmic used intravenously to treat VT and prevent VF. It act by blocking both open and closed cardiac sodium channel