This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
Hilar dance is seen in fluroscopy of- 
Select and explain. 
A. Patent ductus aeriosus, B. Aoic stenosis, C. Coarctation of aoa, D. Mitral stenosis
A: Patent ductus aeriosus
Answer: A: Patent ductus aeriosus 
Explanation: hi*lar dance vigorous pulmonary aerial pulsations due to increased blood flow, often seen fluoroscopically in patients with congenital left-to-right shunts, especially atrial septal defect(patent ductus aerosis) Ref Davidson 23rd edition pg 453