A 52 year old man presents with hyponatremia, hyperkalemia, hypercalcemia and hyperpigmentation

A 52 year old man presents with hyponatremia, hyperkalemia, hypercalcemia and
hyperpigmentation. What hormone should be measured in him?

A. Aldosterone
B. Cortisol
C. Renin
D. ACTH
E. Testosterone