11.下列關於central cord syndrome的敘述,何者錯誤? (A)上肢的運動功能缺損大於下肢 (B)常導因於acute cervical hyperflexion injury (C)可能伴隨有sphincter dysfunction,通常造成urinary retention (D)通常下肢的肌力會比上肢的肌力早回復