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
All of the following statements about clonidine are true EXCEPT: 
Select and explain. 
A. It is an α–adrenergic agonist, B. It can cause dry mouth as an adverse effect, C. Prazosin completely antagonizes it's action, D. It inhibits sympathetic outflow.
C: Prazosin completely antagonizes it's action
Answer: C: Prazosin completely antagonizes it's action 
Explanation: None