**Core Concept**
Primary hyperaldosteronism is a condition characterized by excessive production of aldosterone, a hormone involved in electrolyte and fluid balance. The underlying pathophysiological principle is an overproduction of aldosterone, leading to sodium retention, potassium excretion, and subsequent hypertension.

**Why the Correct Answer is Right**
In primary hyperaldosteronism, the excessive production of aldosterone leads to hypertension due to sodium retention and water retention. This results in hypokalemia (low potassium levels) due to increased potassium excretion in the urine. Additionally, secondary hyperreninemia occurs due to the decreased renin-aldosterone feedback mechanism. However, the characteristic feature of primary hyperaldosteronism is the absence of hyporeninemic hypoadrenalism, which is often seen in familial hyperaldosteronism type 4.

**Why Each Wrong Option is Incorrect**
**Option A:** Aldosterone levels are typically elevated in primary hyperaldosteronism, so this option is incorrect.
**Option B:** Hypokalemia is a common finding in primary hyperaldosteronism due to excessive potassium excretion, making this option incorrect.
**Option C:** Hypertension is a hallmark of primary hyperaldosteronism due to sodium and water retention, making this option incorrect.

**Clinical Pearl / High-Yield Fact**
Primary hyperaldosteronism is a common cause of secondary hypertension and can be diagnosed through the measurement of aldosterone levels and renin activity.

**Correct Answer: C. Hyporeninemic hypoadrenalism is seen in familial hyperaldosteronism type 4.**