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
Mechanism of action of bromocriptine is: 
Select and explain. 
A. Agonism at D2 receptors, B. Antagonism at D2 receptors, C. Antagonism at D1 receptors, D. Antagonism at α receptors
A: Agonism at D2 receptors
Answer: A: Agonism at D2 receptors 
Explanation: None