This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Proteins and Amino Acids, Subject name: Biochemistry
Which of the following is not true about Cystinosis? 
Select and explain. 
A. Cysteine stones in urine common, B. Corneal crystals, C. Fanconi syndrome, D. White blond hair and photophobia
A: Cysteine stones in urine common
Answer: A: Cysteine stones in urine common 
Explanation: Ans. A. Cysteine stones in urine commonCystinosis is an autosomal recessive genetic disorder of the renal tubules, characterized by the presence of carbohydrates and amino acids in the urine, excessive urination, and low blood levels of potassium and phosphates.Amino acidConditionEnzyme DefectClinical FindingsInheritanceCystineCystinosis (Lysosomal Membranes)Cystinosis CTNS (lysosomal efflux)Renal Fanconi syndrome, Rickets,Renal failure, Photophobia,Hypotonia,Hypothyroidism,Blindness.ARCystine, lysine, arginine, ornithineClassic cystinuriaProximal renal tubule, jejunal mucosa Shared dibasic cystine Transport protein SLC3A1, SLC7A9Cystine nephrolithiasisAR