This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autonomic nervous system, Subject name: Pharmacology
Selective alpha 2 agonist is 
Select and explain. 
A. Tizanidine, B. Prazosin, C. Adrenaline, D. Propanolol
A: Tizanidine
Answer: A: Tizanidine 
Explanation: Ref: HL Sharma 3rd ed pg no:180 Clonidine, methyldopa, tizanidine, relminidine are central alpha 2 agonists