<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 20-year-old man is brought to the emergency department 20 minutes after he sustained a stab wound to his back during an altercation. He reports weakness and numbness of the lower extremities. He has no history of serious illness. On arrival, he is alert and cooperative. His pulse is 90min, and blood pressure is 10065 mm Hg. Examination shows a deep 4-cm laceration on his back next to the vertebral column at the level of the T10 vertebra. Neurologic examination shows right-sided flaccid paralysis with a diminished vibratory sense ipsilaterally, decreased sensation to light touch at the level of his laceration and below, and left-sided loss of hot, cold, and pin-prick sensation at the level of the umbilicus and below. Deep tendon reflexes of his right lower extremity are 4 and symmetrical. Babinski sign is absent bilaterally. The remainder of the examination shows no abnormalities. Which of the following is the most likely diagnosis?? A: Anterior cord syndrome, B: Cauda equina syndrome, C: Brown-Sequard syndrome, D: Posterior cord syndrome, E: Central cord syndrome,  <response>: This is a clinical vignette describing a 20-year-old man who sustained a stab wound to his back at the level of the T10 vertebra. He now has neurological deficits in his lower extremities, including right-sided flaccid paralysis with decreased sensation, and left-sided loss of sensation below the umbilicus. The location of the injury at the T10 vertebral level and the described neurological deficits localizing to specific spinal cord tracts suggest a spinal cord injury. The differential diagnosis includes various spinal cord syndromes based on the pattern of sensory and motor deficits.Anterior cord syndrome is unlikely as it would cause bilateral motor deficits. Cauda equina syndrome is unlikely as it would cause bowelbladder dysfunction and bilateral lower extremity findings. The unilateral motor deficits with contralateral sensory loss below the injury level is classic for Brown-Sequard syndrome, which results from hemisection of the spinal cord. This is most consistent with the patients presentation.Central cord syndrome could present similarly with asymmetric findings, but reflexes are typically brisk and Babinski sign is often present, which this patient does not have. Posterior cord syndrome is unlikely as it would cause loss of proprioception and vibratory sensation.C: Brown-Sequard syndrome 