<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 2-year-old boy is brought to the emergency department because of a 5-minute episode of repetitive, involuntary, twitching movements of his left arm that occurred 1 hour ago. His symptoms began while playing with some toys. His parents say that he began to stand with support at 18 months and has recently started to walk with support. He speaks in bisyllables. He is at the 70th percentile for length and 80th percentile for weight. His vital signs are within normal limits. Examination shows a purple-pink patch over the right cheek that extends to the right eyelid. The right eyeball is firm. Neurologic examination shows left arm hypotonia and absent bicep reflex on the left side. Fundoscopy shows cupping of the right optic disc. Which of the following is the most likely cause of this patients symptoms?? A: Ataxia telangiectasia, B: Hereditary hemorrhagic telangiectasia, C: Sturge-Weber syndrome, D: Klippel-Trenaunay syndrome, E: Neurofibromatosis type 1,  <response>: Based on the information provided in the question stem, this 2-year-old boy has presented with a brief episode of involuntary twitching movements seizure in his left arm, as well as delayed motor milestones, speech delay, a facial skin lesion, left arm hypotonia, absent left bicep reflex, and optic disc changes. The seizure, motor delays, speech delay, and left-sided neurologic findings suggest a neurological disorder affecting the right side of the brain. The facial skin lesion and optic disc changes point towards a diagnosis involving vascularangiomatous abnormalities. Of the choices provided, Sturge-Weber syndrome, also known as encephalotrigeminal angiomatosis, is characterized by facial cutaneous vascular malformations port-wine stain, leptomeningeal angiomas, and eye abnormalities often leading to glaucoma. This explains the patients facial lesion, optic disc changes, and right-sided neurologic abnormalities. The other answer choices do not fit the constellation of this patients clinical presentation.C: Sturge-Weber syndrome 