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': 'Hilar dance on fluoroscopy is seen in: \nSelect and explain. \nA. ASD, B. TOF, C. VSD, D. TGV', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. ASD', 'role': 'assistant'}]