21. A patient suffered from chronic low back pain with radiating to buttock, poster lateral thigh and
lateral aspect of lower leg. Muscle weakness was observed in the extensor hallucis longus and
tibialis anterior. Which lumbosacral root compression is the most likely？
(A) L2 root compression
(B) L3 root compression
(C) L4 root compression
(D) L5 root compression
(E) S1 root compression
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