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
[{'content': 'Pharmacological stressor used in PET scan to detect cardiac function is \nSelect and explain. \nA. Dopamine, B. Dobutamine, C. Droxidopa, D. Nor adrenaline', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Instead of treadmill test,dobutamine can be used.', 'role': 'assistant'}]