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': "Triangular shaped heart is a radiological finding of \nSelect and explain. \nA. Constrictive pericarditis, B. Mitral incompetence, C. TAPVC, D. Ebstein's anomaly", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Triangular shaped heart - Constrictive Pericarditis.\nPentagon shaped heart - Mitral incompetence.', 'role': 'assistant'}]