**Core Concept**
Pheochromocytoma is a rare, usually benign, tumor of the adrenal gland that arises from the chromaffin cells, leading to excessive production of catecholamines such as adrenaline and noradrenaline. This results in symptoms like hypertension, tachycardia, and sweating.

**Why the Correct Answer is Right**
The correct answer relates to the pathophysiology of pheochromocytoma. Pheochromocytomas secrete catecholamines, which bind to alpha-1 adrenergic receptors in the blood vessels, causing vasoconstriction and subsequent hypertension. The excessive catecholamines also stimulate the release of renin from the juxtaglomerular cells in the kidneys, leading to further vasoconstriction and hypertension. The correct answer highlights this critical aspect of pheochromocytoma.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because pheochromocytomas are typically benign and not malignant. Malignant pheochromocytomas are rare, but the question does not specify this context.
**Option B:** Incorrect because while pheochromocytomas can cause hypertension, this is not the most specific or direct effect of catecholamine excess.
**Option C:** Incorrect because while pheochromocytomas can cause tachycardia, this is a secondary effect of catecholamine excess, not the primary pathophysiological consequence.

**Clinical Pearl / High-Yield Fact**
The "rule of 10s" is a useful clinical correlation for pheochromocytoma: 10% of pheochromocytomas are extra-adrenal, 10% are malignant, and 10% are bilateral.

**Correct Answer: B. Excessive catecholamine production leads to vasoconstriction via alpha-1 adrenergic receptors.**