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': 'The "Great Hilar Dance" sign of flouroscopy is seen in \nSelect and explain. \nA. ASD, B. VSD, C. TGA, D. TAPVC', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Vigorous arterial pulsations due to increased blood flow, seen flouroscopically in patients with ASD.', 'role': 'assistant'}]