This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular Radiology, Subject name: Radiology
[{'content': 'Great Hilar Dance on Fluoroscopy is a feature of \nSelect and explain. \nA. PDA, B. ASD, C. VSD, D. MS', 'role': 'user'}, {'content': 'Answer: B \nExplanation: *Great Hilar Dance is Vigorous pulmonary aerial pulsations seen due to increased blood flow, seen fluoroscopically in patients with Atrial septal defects.', 'role': 'assistant'}]