**Core Concept**
Medical adrenalectomy refers to the suppression of adrenal gland function, typically through pharmacological means. This concept is crucial in understanding the management of conditions like Cushing's syndrome, where excess cortisol production is a concern. The adrenal glands play a vital role in producing **hormones** such as **cortisol** and **aldosterone**.

**Why the Correct Answer is Right**
The correct answer is related to the use of medications that inhibit adrenal steroidogenesis, such as **ketoconazole**, **metirapone**, or **etomidate**. These drugs can suppress the production of cortisol, thereby achieving a "medical adrenalectomy." This approach is often used in the management of Cushing's syndrome, particularly when surgical adrenalectomy is not feasible.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it is not directly related to the suppression of adrenal function.
**Option B:** Incorrect as it does not involve the suppression of adrenal steroidogenesis.
**Option C:** Incorrect because it is not a recognized method for achieving medical adrenalectomy.
**Option D:** Incorrect as it is not directly associated with the pharmacological suppression of adrenal function.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that medical adrenalectomy is a temporary measure and does not permanently damage the adrenal glands, allowing for potential recovery of adrenal function once the underlying condition is managed. This is crucial in the context of treating conditions like Cushing's syndrome.

**Correct Answer:** D. Ketoconazole.