This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Amino Acid Metabolic Disorder, Subject name: Biochemistry
[{'content': 'Hartnup disease, limiting amino acid - \nSelect and explain. \nA. Tyrosine, B. Tryptophan, C. Phenylalanine, D. None', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans is 'b' i. e., Tryptophan Co-Factor/Limiting Amino Acid Therapy CofactorLimiting amino acido PKU-Tyrosineo Neonatal tyrosinemia. Alkaptonuria, HawkinsuriaVit.C-o Maple Syrup Urine diseaseB1 (Thiamine)-o Hartnup diseaseNiacinTryptophano Mitochondrial diseaseB6-o Classical HomocystinuriaB6 & Folic a.Cystineo Methyl Malonyl acidemiaB12 o Isovaleric acidemia-Glycine, carnitine", 'role': 'assistant'}]