This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': "A patient Pushpa comes to you in the medicine emergency and you diagnose her to be suffering from severe CHF. You choose a drug 'Z' which is a short term ionotropic agent having selective adrenergic agonistic activity but lacking dopaminergic agonistic activity. What can be 'Z' ? \nSelect and explain. \nA. Dopamine, B. Dobutamine, C. Amrinone, D. Salmeterol", 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]