This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Amino acid Metabolism, Subject name: Pediatrics
A child presented with tall stature, long spider leg like fingers, chest deformity and some vision problems. His eye examination shows the following: What is your diagnosis? 
Select and explain. 
A. Marfan syndrome, B. Lowe syndrome, C. Homocystinuria, D. GM1 gangliosidosis
A: Marfan syndrome
Answer: A: Marfan syndrome 
Explanation: The skeletal abnormalities like tall stature, long spider leg like fingers, chest deformity and presence of eye lens dislocation in the superolateral direction, points to a diagnosis of Marfan syndrome. Homocystinuria- inferonasal dislocation of lens + marfanoid features Lowe syndrome- cataract GM1 gangliosidosis- macular cherry red spots