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
[{'content': 'Wide pulse pressure is seen in- \nSelect and explain. \nA. Aoic regurgitation, B. PDA, C. MR, D. AS', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The aerial pulse pressure is widened as a result of both systolic hypeension and a lowering of the diastolic pressure. The measurement of aerial diastolic pressure with a sphygmomanometer may be complicated by the fact that systolic sounds are frequently heard with the cuff completely deflated. As the disease progresses and the LV end-diastolic pressure rises, the aerial diastolic pressure may actually rise as well, because the aoic diastolic pressure cannot fall below the LV end-diastolic pressure. For the same reason, acute severe AR may also be accompanied by only a slight widening of the pulse pressure. Such patients are invariably tachycardic as the hea rate increases in an attempt to preserve the CO ( Harrison&;s principle of internal medicine,18th edition,pg no.1944 )', 'role': 'assistant'}]