A 25 year old man presents with a kidney stone . He is married to his first Cousin and 6 months earlier , his 8 year - old son had a kidney stone as well diagnosis is .: (A) PCKD, (B) Medullary Cystic disease, (C) Fanconi syndrome, (D) Cystinuria
Answer is D. Cystinuria  is the most common cause of stones in Childhood.