<prompt> Chronic thiazide therapy causes persistent hypercalcemia due to -Renal tubular acidosisFanconis syndromeHypervitaminosis DHyperparathyroidism  <response>: Ans. is d i.e., Hyperparathyroidism o Chronic thiazide therapy causes hypercalcemia because it enhances the parathyroid mediated increase of Ca reabsorption. 