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': 'Flask shaped heart is seen in – \nSelect and explain. \nA. Ebstein anomaly, B. Pericardial effusion, C. TOF, D. TAPVC', 'role': 'user'}, {'content': 'Answer: B \nExplanation: With a large pericardial effusion the heart appears enlarged and globular in shape, the so-called "water - bottle" or "Flask - shaped" without pulmonary venous congestion.', 'role': 'assistant'}]