This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Medicine
[{'content': 'water hammer pulse is seen in ? \nSelect and explain. \nA. Aoic regurgitation, B. mitral stenosis, C. Aoic stenosis, D. left ventricular failure', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ref : harrisons 21st ed', 'role': 'assistant'}]