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
Dopamine agonist used in diabetes 
Select and explain. 
A. Metformin, B. Bromocriptine, C. Cabergoline, D. Vanadium salts
B: Bromocriptine
Answer: B: Bromocriptine 
Explanation: 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