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: Surgery
The effect of local anesthesia can be increased by the addition of 
Select and explain. 
A. Adrenaline, B. Isoprenaline, C. Dopamine, D. Felypressin (synthetic vasopressin)
A: Adrenaline
Answer: A: Adrenaline 
Explanation: None