This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
[{'content': 'Which of the following inborn errors of metabolism is associated with mental retardation - \nSelect and explain. \nA. Alkaptonuria, B. Homocystinuria, C. Pentosuria, D. All', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., Homocystinuria Metabolic disorders associated with mental retardation. i) Aminoaciduria Phenylketonuria, homocystinemia, histidinemia ii) Galactosemia iii) Mucopolysaccharidosis", 'role': 'assistant'}]