True or False: Hyperpigmentation is a symptom of Addison's disease.

Hyperpigmentation is indeed a symptom of Addison's disease, which is a condition characterized by insufficient production of certain hormones by the adrenal glands, including cortisol and aldosterone. In Addison's disease, the body produces higher levels of adrenocorticotropic hormone (ACTH) due to low cortisol levels. ACTH stimulates melanin production, leading to darkened patches of skin, particularly in areas exposed to sunlight, scars, or skin folds. This is why hyperpigmentation is commonly associated with Addison's disease, making the statement true.

Other options might suggest different viewpoints or uncertainty about the effects of Addison's disease on skin pigmentation, but the established medical understanding clearly links hyperpigmentation to this endocrine disorder.