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
Contractile dysfuncation seen in which type of cardiomyopathy? 
Select and explain. 
A. Dilated cardiomyopathy, B. Restrcited cardiomyopathy, C. Hyperophic cardiomyopathy, D. Infiltrative cardiomyopathy
A: Dilated cardiomyopathy
Answer: A: Dilated cardiomyopathy 
Explanation: Dilated cardiomyopathy (DCM) is characterized by progressive cardiac dilation and contractile (systolic) dysfunction, usually with concurrent hyperophy; regardless of cause, the clinicopathologic patterns are similar. DCM results in systolic (contractile) dysfunction. Causes include myocarditis, toxic exposures (e.g., alcohol), and pregnancy. In 20% to 50% of cases, mutations affecting cytoskeletal proteins are responsible. Ref Harrison 20th edition pg 1445