This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
[{'content': 'Dopamine agonist used in diabetes \nSelect and explain. \nA. Metformin, B. Bromocriptine, C. Cabergoline, D. Vanadium salts', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bromocriptine and cabergoline are dopamine agonists but bromocriptine usage in type 2 diabetes is approved.It has an interesting mechanism of action by inhibiting the dopamine dip that causes in early morning leading to hyperglycemia. Ref: Goodman and Gillman 13th ed', 'role': 'assistant'}]