<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 22-year-old man comes to the physician because of headaches and blurry vision for the past 6 months. He also reports frequent episodes of vomiting over the last month. His father has died of renal cell carcinoma at the age of 37 years. Examination shows 2040 vision bilaterally. Fundoscopic examination shows bilateral optic disc swelling and growth of capillary vessels in the temporal peripheral retina. An MRI of the brain shows an infratentorial mass. The patient undergoes surgical resection of the mass. A photomicrograph of the resected specimen is shown. Which of the following is the most likely diagnosis?? A: Medulloblastoma, B: Glioblastoma, C: Oligodendroglioma, D: Hemangioblastoma, E: Ependymoma,  <response>: This is a clinical case question involving a young man with headaches, blurry vision, vomiting, and family history of renal cell carcinoma. The key findings are bilateral optic disc swelling, retinal capillary growth, and an infratentorial brain mass on MRI. The photomicrograph shows characteristic findings of a hemangioblastoma. The patients symptoms of increased intracranial pressure are explained by the brain mass. The retinal findings suggest von Hippel-Lindau disease. This autosomal dominant disorder can cause hemangioblastomas in the brain, retina, and other organs, as well as renal cell carcinoma. The patients family history of early renal cell carcinoma raises suspicion for von Hippel-Lindau disease. The photomicrograph shows vascular proliferation and stromal cells, characteristic of a hemangioblastoma. The infratentorial location also points to this diagnosis. The other options can be ruled out based on the clinical presentation and histopathology.D: Hemangioblastoma 