This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
Vitamin D toxicity is treated with 
Select and explain. 
A. Chloroquine, B. Hydroxycholoquine, C. Dexamethasone, D. Ketoconazole
C: Dexamethasone
Answer: C: Dexamethasone 
Explanation: Ans. C. Dexamethasone* Dexamethasone is used in the treatment of hypercalcemia due to vitamin D toxicity. Glucocoicoid (Dexamethasone, prednisolone etc) therapy will decrease plasma calcium levels by blocking the action of vitamin D(1,25 D) which results in reduced intestinal calcium absorption and increased urinary excretion of calcium. * Other drugs like chloroquine and hydroxychloroquine are less effective in treating hypercalcemia due to vitamin D toxicity.