**Core Concept**
Medical adrenalectomy refers to the pharmacological suppression of adrenal hormone production, achieved through the use of medications that inhibit the enzymes involved in steroidogenesis. This process is crucial in managing conditions such as Cushing's syndrome, where excess cortisol production is detrimental.

**Why the Correct Answer is Right**
The correct answer involves the inhibition of 11β-hydroxylase, an enzyme crucial for the final step in cortisol synthesis. Inhibiting this enzyme leads to the accumulation of 11-deoxycortisol, which is then shunted towards the production of mineralocorticoids, rather than cortisol. This results in a decrease in cortisol levels, effectively achieving a "medical adrenalectomy" of cortisol production. This concept is based on the understanding of the steroidogenesis pathway, where 11β-hydroxylase is the enzyme responsible for converting 11-deoxycortisol to cortisol.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not accurately describe the process of medical adrenalectomy. The term "aldosterone antagonist" refers to medications that block the action of aldosterone, rather than suppressing its production.
**Option B:** This option is incorrect as it is not directly related to the suppression of adrenal hormone production. The term "steroidogenesis inhibitor" is too broad and does not specifically refer to the inhibition of 11β-hydroxylase.
**Option C:** This option is incorrect as it describes a different mechanism of action. The term "glucocorticoid receptor antagonist" refers to medications that block the action of glucocorticoids, rather than suppressing their production.

**Clinical Pearl / High-Yield Fact**
In medical adrenalectomy, the use of 11β-hydroxylase inhibitors can lead to an increase in blood pressure due to the accumulation of mineralocorticoids. This is a critical consideration in the management of patients with Cushing's syndrome.

**Correct Answer: A. Metyrapone**