Final answer:
Hyperadrenocorticism (HAC) is excessive adrenal gland activity, known as Cushing's syndrome, characterized by an overproduction of cortisol with symptoms such as obesity, moon face, and depression.
Step-by-step explanation:
Hyperadrenocorticism (HAC) refers to excessive adrenal gland activity, which is option B. This condition, also known as Cushing's syndrome or Cushing's disease when due to a pituitary tumor, is characterized by an overproduction of cortisol. Overproduction of cortisol can cause a range of symptoms such as high blood glucose levels, the formation of lipid deposits on the face (moon face), a buffalo hump on the back of the neck, rapid weight gain, and hair loss. Adrenal hypersecretion can also lead to conditions such as osteoporosis and depression. Diagnosis and treatment of Cushing's syndrome depend on its underlying cause, which may include surgery or medication to suppress adrenal activity.