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
[{'content': "Duroziez's sign is seen in \nSelect and explain. \nA. Aoic regurgitation, B. Tricuspid regurgitation, C. Mitral stenosis, D. Carcinoid syndrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref Harrison 19 th ed pg 1536 booming "pistol-shot" sound can be heard over the femoral aeries (Traube\'s sign), and a to-and-fro murmur (Duroziez\'s sign) is audible if the femoral aery is lightly compressed with a stethoscope.', 'role': 'assistant'}]