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
[{'content': 'Pulse pressure is: \nSelect and explain. \nA. 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.', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer is C (Systolic -- Diastolic B.P) Pulse pressure is the difference between the systolic pressure and the diastolic pressure.', 'role': 'assistant'}]