**Core Concept**
Pseudo resistant hypertension is a condition where patients appear to have uncontrolled hypertension due to factors other than the actual blood pressure being unresponsive to treatment. This concept is crucial in clinical practice as it can lead to unnecessary investigations, medication changes, and potential harm to the patient.

**Why the Correct Answer is Right**
Pseudo resistant hypertension is often seen in patients with **white coat hypertension**, where the blood pressure elevation is due to the stress of visiting the doctor's office rather than an actual increase in blood pressure. This can be due to the **activation of the sympathetic nervous system**, leading to increased heart rate and blood pressure. Other causes of pseudo resistant hypertension include **medication resistance** due to non-adherence, **renal artery stenosis**, and **pseudoresistance due to measurement errors**.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to pseudo resistant hypertension.
**Option B:** While secondary hypertension can be a cause of resistant hypertension, it is not the same as pseudo resistant hypertension.
**Option C:** This option is not a recognized cause of pseudo resistant hypertension.

**Clinical Pearl / High-Yield Fact**
Remember that pseudo resistant hypertension can be a common cause of apparent treatment failure, and a thorough evaluation, including 24-hour ambulatory blood pressure monitoring, is essential to identify and address these underlying factors.

**Correct Answer: C. Renal artery stenosis**