<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 65-year-old woman comes to the physician for the evaluation of sharp, stabbing pain in the lower back for 3 weeks. The pain radiates to the back of her right leg and is worse at night. She reports decreased sensation around her buttocks and inner thighs. During the last several days, she has had trouble urinating. Three years ago, she was diagnosed with breast cancer and was treated with lumpectomy and radiation. Her only medication is anastrozole. Her temperature is 37C 98.6F, pulse is 80min, respirations are 12min, and blood pressure is 13070 mm Hg. Neurologic examination shows 45 strength in the left lower extremity and 25 strength in her right lower extremity. Knee and ankle reflexes are 1 on the right. The resting anal sphincter tone is normal but the squeeze tone is reduced. Which of the following is the most likely diagnosis?? A: Conus medullaris syndrome, B: Cauda equina syndrome, C: Central cord syndrome, D: Brown-sequard syndrome, E: Anterior spinal cord syndrome,  <response>: This is a clinical vignette describing a 65-year-old woman with sharp, stabbing back pain radiating to her right leg, decreased sensation in her buttocks and thighs, trouble urinating, history of breast cancer, and neurologic findings of weakness and reduced reflexes in the right lower extremity. The key findings are back pain radiating to the leg, decreased sensation in a saddle distribution, trouble urinating, and asymmetric neurologic deficits in the lower extremities. This presentation is most consistent with cauda equina syndrome given the combination of back pain, saddle anesthesia, bladder dysfunction, and asymmetric neurologic deficits in the lower extremities. Conus medullaris syndrome would not cause saddle anesthesia or bladder dysfunction. Central cord syndrome presents with greater upper extremity than lower extremity deficits. Brown-sequard syndrome causes loss of ipsilateral motor function and contralateral paintemperature sensation. Anterior spinal cord syndrome does not cause asymmetric findings.B: Cauda equina syndrome 