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
[{'content': 'Contractile dysfuncation seen in which type of cardiomyopathy? \nSelect and explain. \nA. Dilated cardiomyopathy, B. Restrcited cardiomyopathy, C. Hyperophic cardiomyopathy, D. Infiltrative cardiomyopathy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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', 'role': 'assistant'}]