question: Q:A 6-year-old boy is brought to the physician by his parents because of right lower extremity weakness, worsening headaches, abdominal pain, dark urine, and a 5-kg (11-lb) weight loss for the past 2 months. His teachers report that he has not been paying attention in class and his grades have been worsening. He has a history of infantile seizures. Physical examination shows a palpable abdominal mass and left costovertebral angle tenderness. Neurological exam shows decreased strength of the right lower limb. He has several acne-like angiofibromas around the nose and cheeks. Further evaluation is most likely to show which of the following?? 
  {'A': 'Port wine stain', 'B': 'Pheochromocytoma', 'C': 'Lisch nodules', 'D': 'Subependymal giant cell astrocytoma', 'E': 'Vestibular schwannoma'},