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
Duration of action of Lidocaine with adrenaline 
Select and explain. 
A. 15-30 minutes, B. 30-60 minutes, C. 2-3 hours, D. 3-6 hours
C: 2-3 hours
Answer: C: 2-3 hours 
Explanation: Duration of action of lidocaine with adrenaline is 2-3 hours. Adrenaline enhances both speed and quality of block, It also prolong effect of lignocaine and reduce the peak blood level and toxicity by reducing the local blood supply duration of action of lidocaine whithout adrenaline is 30-90min