單項選擇題下肢牽涉痛是由哪一神經(jīng)受刺激所致()

A.脊神經(jīng)前根
B.脊神經(jīng)后根
C.交感神經(jīng)
D.脊神經(jīng)前支
E.脊神經(jīng)后支