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 drug act on the dopaminergic receptors except: September 2005 
Select and explain. 
A. Domperidone, B. Dobutamine, C. Fenoldopam, D. Metclopramide
B: Dobutamine
Answer: B: Dobutamine 
Explanation: Ans. B: Dobutamine A. Dopamine agonists include Bromocriptine Cabergoline Pergolide Pramipexole Ropinirole Apomorphine Rotigotine Some, such as fenoldopam, are selective for dopamine receptor Dl B. Dopamine antagonists Used as atypical antipsychotics (coupled with serotonin antagonist effects): - Clozapine - Risperidone - Olanzapine - Ziprasidone Used as antiemetics: - Metoclopramide - Droperidol - Domperidone Used as tricyclic antidepressants: -- Amoxapine