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
Which of the following is a skeletal muscle relaxant that acts as a central α2 adrenergic agonist : 
Select and explain. 
A. Tizanidine, B. Brimonidine, C. Chlormezanone, D. Quinine
A: Tizanidine
Answer: A: Tizanidine 
Explanation: None