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': 'Drugs associated with clinically useful or physiologically important positive inotropic effects include all of the following except: \nSelect and explain. \nA. Amrinone, B. Enalapril, C. Digoxin, D. Dobutamine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]