This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney Stones & Renal Tubular Acidosis, Subject name: Medicine
Causes of low urinary calcium include? 
Select and explain. 
A. Renal tubular acidosis, B. Cushing's syndrome, C. Chronic glomerulonephritis/CKD, D. Paget's disease
C: Chronic glomerulonephritis/CKD
Answer: C: Chronic glomerulonephritis/CKD 
Explanation: A 1- hypercalciuria and nephrolithiasis. In Cushing syndrome- | coisol- | bone turnover and increased urinary calcium is seen. In Paget's disease of bone, urinary calcium is normal or increased In chronic glomerulonephritis, ESRD will ensue- decrease in vitamin D3, hypocalcemia and low urinary calcium. Causes of Hypocalciuria Drugs including thiazide diuretics Hypoparathyroidism, Pseudohypoparathyroidism Rickets Hypothyroidism Nephrosis/chronic kidney disease Familial hypocalciuric hypercalcemia (FHH), also known as familial benign hypercalcemia