This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Water hammer pulse seen in - 
Select and explain. 
A. Aortic stenosis, B. Aortic regurgitation, C. Aortic stenosis and Aortic regurgitation, D. Mitral regurgitation
B: Aortic regurgitation
Answer: B: Aortic regurgitation 
Explanation: None