<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 68-year-old man is brought to the emergency department because of progressive weakness of his lower extremities and urinary incontinence for the past 2 weeks. Over the past 2 months, he has had increasing back pain. His temperature is 37.1C 98.8F, pulse is 88min, and blood pressure is 10660 mm Hg. Examination shows an ataxic gait. Muscle strength is decreased in bilateral lower extremities. Sensation to pain, temperature, and position sense is absent in the buttocks, perineum, and lower extremities. Ankle clonus is present. Digital rectal examination is unremarkable. An x-ray of the spine shows multiple sclerotic lesions in the thoracic and lumbar vertebrae. Further evaluation of this patient is most likely to show which of the following?? A: Left testicular mass, B: Irregular, asymmetric mole, C: Enlarged left thyroid lobe, D: Bence Jones protein in the urine, E: Elevated prostate-specific antigen,  <response>: This is a clinical vignette describing a 68-year-old man with progressive weakness of the lower extremities, urinary incontinence, and back pain over the past 2 months. He has signs of upper motor neuron disease on exam, including weakness, hyperreflexia, positive Babinski sign, and sensory loss. Imaging shows sclerotic lesions in the thoracic and lumbar vertebrae. This presentation is most consistent with metastatic cancer to the spine causing spinal cord compression. The history, exam, and imaging findings all support this diagnosis. The correct answer will be a cancer that commonly metastasizes to bone. Prostate cancer is the most common primary cancer to metastasize to bone in men over 50. Elevated prostate-specific antigen PSA would confirm the diagnosis.E: Elevated prostate-specific antigen 