In diabetes insipidus, diuretic showing paradoxical antiduretic activity -
Thiazide
Triamterene
Spironolactone
Furosemide
Ans. is 'a' i.e., Thiazide Thiazide diuretics paradoxically decrease urine output in DI due to formation of cAMP in distal tubules effective in both central and nephrogenic DI.