Question: 7-years old patient complains of recurrent abdominal pain, skin rash, increased sweating, decreased amount of urine. There is nocturia. BP 90/60 mmHg. Urinalyis: density - 1028, protein - 0,04 g/L, WBC - 9-10 in the field, modified red blood cells - 6-8 in field, salts - oxalates- large number. What is your diagnosis? A Acute glomerulonephritis with nephritic syndrome B Urinary Tract Infection C Acute renal failure D Tubulopathies E Dysmetabolic Nephropathy