This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolic disorders, Subject name: Pediatrics
[{'content': 'A child has microcephaly, Blue eyes, Fair skin, and Mental retardation, Ferric chloride test is positive. What is the likely diagnosis \nSelect and explain. \nA. Phenylketonuria (PKU), B. Homocystinuria, C. Tyrosinosis, D. Alkaptonuria', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Individuals with phenylketonuria have profound and irreversible intellectual disability,microcepgaly,epilepsy and behavioral problems.These patients often have a musty body odour and skin conditions such as eczema caused by excretion of excessive phenylalanine and its metabolites.Decreased skin hair, and eye pigmentation may also be present due to reduced melanin synthesis.Ferric chloride test will be positive due to the presence of phenols,which are its metabolites. Reference:Essential pediatrics-Ghai,8th edition,page no:652', 'role': 'assistant'}]