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
According to Broun "Chemical tourniquet" is: 
Select and explain. 
A. Adrenaline., B. Hyaluronidase, C. Both, D. None
A: Adrenaline.
Answer: A: Adrenaline. 
Explanation: Adrenaline was discovered by Albel. Broun suggested using adrenaline as a "Chemical tourniquet" to prolong the duration of local anesthetics.