This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of protein and amino acid, Subject name: Biochemistry
In Hanup's disease, the following amino acids are excreted into the urine 
Select and explain. 
A. Basic amino acids, B. Acidic amino acids, C. Neutral amino acids, D. Hydrophilic aminoacids
C: Neutral amino acids
Answer: C: Neutral amino acids 
Explanation: Hanup disease reflects impaired intestinal and renal transpo of tryptophan and other neutral amino acids.The defect limits tryptophan availability for niacin biosynthesis and accounts for the pellagra-like signs and symptomsHarper 30th edition Pg: 308