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
True about local anaesthetic – a) Cocaine acts by decreasing norepinephrineb) Act by decreasing sodium entry into cellc) Lignocaine is an amided) Dibucaine is drug of choice for epidural anaesthesia 
Select and explain. 
A. a, B. c, C. ac, D. bc
D: bc
Answer: D: bc 
Explanation: Local anesthetics prevent influx of Na+ by inhibiting Na+ channel.
Lignocaine (Lidocaine) is an amide.
Dibucaine is not used for epidural anesthesia. Lidocaine and bupivacaine are the most commonly used local anesthetics for spinal and epidural anesthesia.