This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
A calcium channel sensitizer approved for use in treatment of Congestive Hea failure is- 
Select and explain. 
A. Levosimendan, B. Nesitritide, C. Vasopressin, D. Nitroprusside
A: Levosimendan
Answer: A: Levosimendan 
Explanation: levosimendan is a calcium channel channel sensitiser used in CHF Levosimendan is a calcium sensitiser that can be administered intravenously (IV) to patients with acute decompensated congestive hea failure (CHF). At therapeutic dosages levosimendan enhances myocardial contractility without increasing oxygen requirements, and causes coronary and systemic vasodilation. Ref Davidson edition23rd pg 463