This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Cystinuria is characterised by – 
Select and explain. 
A. Generalised aminoaciduria, B. Systemic acidosis, C. Deposition of cystine crystals in Renal tubular cells, D. Recurrent urinary caliculi
D: Recurrent urinary caliculi
Answer: D: Recurrent urinary caliculi 
Explanation: Cystinuria

It is an autosomal recessive disorder.
The disease is caused by a defective high affinity transporter for L-cystine and diabasic amioacids present in the proximal tubules.
It is characterize by recurrent kidney stone formation.