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
Pulse pressure is calculated by ? 
Select and explain. 
A. 1/3 diastolic +1/2 systolic B.P., B. 1/2 diastolic +1/3 systolic B.P., C. Systolic-diastolic B.P., D. Diastolic + 1/2 systolic B.P.
C: Systolic-diastolic B.P.
Answer: C: Systolic-diastolic B.P. 
Explanation: The pulse pressure is the difference between systolic and diastolic pressures, normally about 50mmHg. Ref : Harrison 20th edition pg 1435