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
Cystinuria presents with excess of 
Select and explain. 
A. Cysteine, B. Tyrosine, C. Glutamine, D. Valine
A: Cysteine
Answer: A: Cysteine 
Explanation: Ans. (a) CysteineRef: Harper's Biochemistry 30th edn. 1301