Hypokalemia is seen with -a) Frusemideb) Cortisolc) Amilorided) Addison's disease
Cortisol at high doses may exert certain mineralocorticoid activity leading to increased retention of sodium and water and increased, excretion of potassium. This leads to hypernatremia and hypokalemia.
Furosemide is a loop diuretic that causes increased excretion of potassium leading to hypokalemia.

About other options.

Amiloride is a potassium sparing diuretic and produces hyperkalemia.
Manifestations of Addison's disease occurs primarily due to mineralocorticoid deficiency.
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