<prompt> An abnormally tall 11 year old with normal mentation is most likely to have which of the following syndromes?Sotos syndromeHomocystinuriaXXYMarfan Syndrome  <response>: Ans. D. Marfan SyndromeMarfan syndrome is an autosomal dominant connective tissue disorder consisting of tall stature, arachnodactyly, thin extremities, increased arm span, and decreased upper body: lower body segment ratio. Additional abnormalities include ocular abnormalities e.g., lens subluxation, hypotonia, kyphoscoliosis, cardiac valvular deformities, and aortic root dilation. 