This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ECG and Arrhythmias 1, Subject name: Medicine
[{'content': 'A 52-year-old woman presents with exeional fatigue and ascites. She is noted to have a rapid, irregular pulse rate. The chest X-ray reveals a small hea with calcification seen on the lateral view. The 12-lead ECG demonstrates low QRS voltage. Clinical diagnosis is? \nSelect and explain. \nA. Rheumatic pan-carditis, B. Constrictive pericarditis, C. Restrictive cardiomyopathy, D. Acute cor-pulmonale', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Calcification & low QRS voltage - indicates Constrictive pericarditis Other option: 1. Restrictive cardiomyopathy -No calcification 2. Acute Cor pulmonale- clots will be present 3. Rheumatic pan carditis - affects children', 'role': 'assistant'}]