**Core Concept**
Pheochromocytoma is a rare, usually benign, tumor of the adrenal glands that produces excess **catecholamines**, such as **epinephrine** and **norepinephrine**. This excess can lead to various clinical manifestations. The underlying principle involves the **sympathetic nervous system** and its response to these hormones.

**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general features of pheochromocytoma. Typical features include **hypertension**, **tachycardia**, **sweating**, **headaches**, and **palpitations** due to the excessive release of catecholamines. The tumor can be diagnosed using **plasma free metanephrines** or **urine fractionated metanephrines** tests.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option details, we can't comment directly, but generally, any option that lists a common symptom or diagnostic feature of pheochromocytoma would be incorrect as the "except" answer.
**Option B:** Similarly, without specifics, we can say that if an option describes a typical presentation or diagnostic method for pheochromocytoma, it's not the answer.
**Option C:** This might include an uncommon or incorrect feature, but without details, it's hard to say.
**Option D:** This could potentially be the correct answer if it lists something not typically associated with pheochromocytoma.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that pheochromocytomas can cause **orthostatic hypotension** despite the presence of hypertension, due to volume depletion from chronic vasoconstriction.

**Correct Answer:** Correct Answer: D. Absence of any specific option details prevents a precise answer.