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
Thiazides and loop diuretics both have opposite action on which of the following ions ? 
Select and explain. 
A. Sodium, B. Potassium, C. Calcium, D. Chloride
C: Calcium
Answer: C: Calcium 
Explanation: Ans. is'c'i.e., Calcium(Ref: KDT 7/e p. 5S2l)Furosemide action on calciumFurosemide increases Ca2+ excretion (contrast thiazides which reduce it)