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: Pharmacology
Epinephrine added to a solution of lignocaine for a peripheral nerve block will : 
Select and explain. 
A. Increase risk of convulsions, B. Increase the duration of action of the local anesthetic, C. Both (a) and (b), D. None of these
B: Increase the duration of action of the local anesthetic
Answer: B: Increase the duration of action of the local anesthetic 
Explanation: None