What’s the most typical symptom of acute aortic dissection？ （）

A.Palpitation， polypnea.

B.The asymmetry between blood pressure and pulsE.

C.Severe and sudden chest pain and back pain.

D.Cerebral vascular accident and paralysis.

E.Tachycardia and dropped blood pressurE.

正确答案：Severe and sudden chest pain and back pain.