This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Medicine
A common finding in osteomalacia is- 
Select and explain. 
A. Low serum phosphate, B. Normal level of 1,25 di-hydroxy vit D3, C. Low serum calcium, D. Increased hydroxy proline in urine
A: Low serum phosphate
Answer: A: Low serum phosphate 
Explanation: Osteomalacia is a feature of long standing hypophoshatemia, which may be a consequence of renal phosphate wasting or chronic use of etidronate or phosphate binding antacids.Serum levels of 1,25(OH)2D levels are low despite normal 25(OH)D levels and elevated PTH.Occurs. in conditions of Increased Calcium level.and there is decreased hydroxy pro line in urine( Harrison 17 pg 2375)