This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Radiology
[{'content': '"Square root sign" is a radiological finding of \nSelect and explain. \nA. Constrictive pericarditis, B. HOCM, C. ASD, D. Pleuro - pericardial cyst', 'role': 'user'}, {'content': 'Answer: A \nExplanation: "Square root sign" - Contrictive pericorditis.\nGround glass ventricular septum\xa0- HOCM.', 'role': 'assistant'}]