This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
[{'content': 'Mechanism of action of levosimendon include \nSelect and explain. \nA. Na channel opener, B. Potassium channel opener, C. Beta blockers, D. Beta 1 agonist', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Mechanism of action Levosimendan exes its positive inotropic effect by increasing calcium sensitivity of myocytes by binding to cardiac troponin C in a calcium-dependent manner. ... The combined inotropic and vasodilatoryactions result in an increased force of contraction, decreased preload and decreased afterload. Refer katzung 11e p221', 'role': 'assistant'}]