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
Drug which can act as antagonis of Haloperidole ? 
Select and explain. 
A. Ropinirole, B. Clozapine, C. Imipramine, D. Pimozide
A: Ropinirole
Answer: A: Ropinirole 
Explanation: Ans. is'a'i.e., Ropinirole Haloperidol is an antipsychotic, acts by > D2 receptor blockage.Ropinirole is an antiparkinsonian drug, acts by > D2 receptor agonist.