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': 'During ventricular abnormal filling square root sign is seen in - \nSelect and explain. \nA. ASD, B. MVPS, C. Dilated cardiomyopathy, D. Constrictive pericarditis', 'role': 'user'}, {'content': "Answer: D \nExplanation: Dip & plateau pattern' or 'square root sign': Early diastolic filling of the ventricles is unimpeded and abnormally rapid, but late diastolic filling is abbreted and halts abruptly when total cardiac volume expands to the volume limit set by the stiff pericardium Ref Harrison 20th edition pg 1523", 'role': 'assistant'}]