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': 'Which of the following is the cause of wide pulse pressure \nSelect and explain. \nA. Aoic stenosis, B. Aoic regurgitation, C. Mitral stenosis, D. Tricuspid stenosis', 'role': 'user'}, {'content': "Answer: B \nExplanation: Signs of Aoic Regurgitation : *Collapsing pulse *Increased pulse pressure *Quincke's sign, Duroziez's sign, de Musset's sign *Murmers : early diastolic murmer, Austin Flint murmur *displaced apex beat, 4th hea sound Reference : Davidson, 23rd Edition, page no : 524.", 'role': 'assistant'}]