This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Pharmacological stressor used in PET scan to detect cardiac function is 
Select and explain. 
A. Dopamine, B. Dobutamine, C. Droxidopa, D. Nor adrenaline
B: Dobutamine
Answer: B: Dobutamine 
Explanation: Instead of treadmill test,dobutamine can be used.