This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
[{'content': 'Dose response curves of salbutamol for bronchodilation and tachycardia are widely separated on dose axis. This information suggested that sulbutamol is \nSelect and explain. \nA. Highly potent cardiac stimulant, B. Highly efficacious bronchodilator, C. Highly toxic drug, D. Highly selective drug', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref-Katzung 10/e p28,29 Wide Separation of two curves on DRC suggest that the dose required to produce one action is much higher than the other.', 'role': 'assistant'}]