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': "In all of the following increased cardiac silhouette sign is seen except: \nSelect and explain. \nA. Tetralogy of Fallot's, B. Pericardial effusion, C. Aoic regurgitation, D. Ebstein anomaly", 'role': 'user'}, {'content': "Answer: A \nExplanation: A i.e. Tetralogy of Fallot's", 'role': 'assistant'}]