Final answer:
A person with Addison's disease would manifest symptoms of hypocortisolism, due to insufficient cortisol production, leading to symptoms like hypotension and fatigue. Therefore, the correct option is d.
Step-by-step explanation:
A client admitted to the hospital with a diagnosis of Addison's disease would likely experience a manifestation of hypocortisolism. Addison's disease is characterized by the hyposecretion of cortisol due to damaged adrenal glands, often from autoimmune disorders or untreated infections, or decreased ACTH output from the pituitary. Symptoms of Addison's disease can include low blood pressure (hypotension), fatigue, and hyperpigmentation of the skin. Treatment typically involves lifelong replacement hormones in pill form.