This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'All are true about Hypertrophic Cardiomyopathy except \nSelect and explain. \nA. Dilated ventricle, B. Increased muscle mass, C. LV outflow obstruction, D. Diastolic failure', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Dilated ventricle # Hypertrophic cardiomyopathy (HCM) is characterized by LV hypertrophy, typically of a nondilated chamber, without obvious cause, such as hypertension or aortic stenosis.> It is found in about 1 in 500 of the general population. Two features of HCM have attracted the greatest attention: Asymmetric LV hypertrophy, often with preferential hypertrophy of the interventricular septum; and A dynamic LV outflow tract pressure gradient, related to narrowing of the subaortic area.> About one-third of patients with HCM demonstrate an outflow tract pressure gradient at rest and a similar fraction develop one with provocation.> The ubiquitous pathophysiologic abnormality is diastolic dysfunction, which can be detected by Doppler tissue imaging and results in elevated LV end-diastolic pressures; the latter may be present despite a hyperdynamic, nondilated LV.', 'role': 'assistant'}]