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
Pulse pressure in severe aortic regurgitation is equal to- 
Select and explain. 
A. 30-45 mmHg, B. 45-60 mmHg, C. 60-75 mmHg, D. 75-90 mmHg
D: 75-90 mmHg
Answer: D: 75-90 mmHg 
Explanation: None