**Core Concept**
The adrenal cortex is a critical component of the hypothalamic-pituitary-adrenal (HPA) axis, and adrenocorticotropic hormone (ACTH) is a key regulator of its function. ACTH stimulates the production and secretion of cortisol from the adrenal cortex, playing a crucial role in the body's response to stress.

**Why the Correct Answer is Right**
ACTH primarily regulates the production of cortisol from the zona fasciculata of the adrenal cortex. However, the zona glomerulosa is primarily under the control of the renin-angiotensin-aldosterone system (RAAS), which is not directly controlled by ACTH. Instead, ACTH stimulates the production of aldosterone in the zona fasciculata, but the zona glomerulosa produces aldosterone in response to angiotensin II.

**Why Each Wrong Option is Incorrect**
**Option A:** While ACTH primarily regulates the production of cortisol, it also has a minor role in regulating the production of androgens, such as dehydroepiandrosterone sulfate (DHEA-S), from the zona reticularis. Therefore, this option is incorrect.

**Option B:** This option is incorrect because ACTH does regulate the production of aldosterone from the zona fasciculata, although the primary regulation of aldosterone production occurs in the zona glomerulosa.

**Option D:** This option is incorrect because ACTH does regulate the production of sex hormones, such as androstenedione and testosterone, from the zona reticularis.

**Clinical Pearl / High-Yield Fact**
The HPA axis is a critical component of the body's response to stress, and dysregulation of this axis can lead to a variety of clinical conditions, including Cushing's syndrome and Addison's disease.

**Correct Answer:** C.