This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Water hammer pulse is seen \nSelect and explain. \nA. Aoic stenosis, B. Aoic regurgitation, C. Aoic stenosis and aoic regurgitation, D. Mitral regurgitation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref Harrison 19 th ed pg 1535 A rapidly rising "water-hammer" pulse, which col- lapses suddenly as aerial pressure falls rapidly during late systole and diastole (Corrigan\'s pulse), and capillary pulsations, an alternate flushing and paling of the skin at the root of the nail while pressure is applied to the tip of the nail (Quincke\'s pulse), are characterist', 'role': 'assistant'}]