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: Psychiatry
[{'content': 'Which of the following antipsychotic is a partial agonist at D2 receptors? \nSelect and explain. \nA. Olanzapine, B. Ziprasidone, C. Aripiprazole, D. Quetiapine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: All antipsychotics are antagonists at D2 receptors except Aripiprazole which is a partial agonist.', 'role': 'assistant'}]