This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Radiology
[{'content': 'This patient, previously healthy, came now with dyspnoea and low grade fever since 4 months. His lungs are clear. JVP is normal. ECG showed low voltage complexes. What is the possible diagnosis? \nSelect and explain. \nA. Tuberculous pericardial effusion, B. Rheumatic Mitral stenosis, C. Syphilitic Aoic aneurysm, D. Hyperophic cariomyopathy', 'role': 'user'}, {'content': 'Answer: A \nExplanation: .', 'role': 'assistant'}]