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
Mechanism of action of levosimenden is ? 
Select and explain. 
A. Inoconstrictor, B. Potassium channel opener, C. Sodium channel opener, D. Beta blocker
B: Potassium channel opener
Answer: B: Potassium channel opener 
Explanation: Ans. is b i.e., Potassium channel opener Levosimendon A new ionodilator is Levosimendon It has inodilator effect by: i) Inotropic effect : Levosimendon is calcium sensitiser, i.e. it increases the sensitivity of the hea to calcium that results in increased cardiac contractility without a rise in intracellular calcium. ii) Vasodilatory effect : by opening ATP-sensitive potassium channels in vascular smooth muscles it causes smooth muscle relaxation.