**Core Concept**
The patient's presentation of hirsutism and masculinization suggests an excess of androgenic hormones. The adrenal cortex produces several hormones, including cortisol, aldosterone, and androgens like dehydroepiandrosterone sulfate (DHEA-S). The likely culprit behind the patient's symptoms is an androgen-producing tumor or hyperplasia in the adrenal cortex.

**Why the Correct Answer is Right**
The adrenal glands produce androgens through the enzyme 17α-hydroxylase, which is involved in the conversion of pregnenolone to 17α-hydroxypregnenolone. The production of androgens is also influenced by the enzyme 3β-hydroxysteroid dehydrogenase (3β-HSD), which is responsible for the conversion of pregnenolone to progesterone. In the case of an androgen-producing tumor or hyperplasia, the adrenal cortex would produce excess androgens, leading to symptoms like hirsutism and masculinization.

**Why Each Wrong Option is Incorrect**
* **Option A:** The zona glomerulosa of the adrenal cortex produces aldosterone, a hormone involved in electrolyte balance and blood pressure regulation. While aldosterone excess can lead to hypertension and hypokalemia, it is not typically associated with hirsutism and masculinization.
* **Option B:** The zona fasciculata of the adrenal cortex produces cortisol, a hormone involved in the body's response to stress. While cortisol excess can lead to Cushing's syndrome, it is not typically associated with hirsutism and masculinization.
* **Option C:** The adrenal medulla produces epinephrine and norepinephrine, hormones involved in the body's "fight or flight" response. These hormones are not typically associated with hirsutism and masculinization.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the adrenal cortex produces androgens through the enzyme 17α-hydroxylase, which is involved in the conversion of pregnenolone to 17α-hydroxypregnenolone. This is a critical pathway to understand in the diagnosis and management of androgen-producing tumors or hyperplasia.

**Correct Answer:** C.