**Core Concept**
Episodic hypertension refers to a condition where blood pressure fluctuates, with periods of high blood pressure alternating with periods of normal or low blood pressure. This phenomenon is often associated with an abnormality in the renin-angiotensin-aldosterone system (RAAS) or other physiological mechanisms that regulate blood pressure.

**Why the Correct Answer is Right**
The correct answer is associated with a condition where there is an excessive release of catecholamines, such as adrenaline, which causes a surge in blood pressure. This is often seen in pheochromocytoma, a rare tumor of the adrenal gland that secretes catecholamines. The episodic nature of hypertension in pheochromocytoma is due to the intermittent release of these hormones, leading to fluctuations in blood pressure.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe a condition characterized by episodic hypertension. While certain medications can cause hypertension, they do not typically cause fluctuations in blood pressure.
**Option B:** This option is incorrect because it is not a recognized condition associated with episodic hypertension. While certain diseases can cause hypertension, they do not typically present with fluctuations in blood pressure.
**Option C:** This option is incorrect because it is not a condition that is typically associated with episodic hypertension. While certain metabolic disorders can cause hypertension, they do not typically present with fluctuations in blood pressure.

**Clinical Pearl / High-Yield Fact**
Pheochromocytomas are often associated with a triad of symptoms: episodic hypertension, tachycardia, and sweating. This triad is a classic presentation of this condition and should prompt further investigation.

**Correct Answer:** C. Pheochromocytoma.