present for the past month. On further questioning, she admits having lost 3 kilograms in the last 2 weeks. On physical examination,

she is a tired-appearing thin woman. Hyperpigmentation is present over many areas of her body, most prominently over the face, neck,

and the backs of her hands (areas exposed to light). Increased production of which of the following hormones is the most likely cause

of hyperpigmentation in this patient?