**Core Concept**
Non-pitting edema, also known as pitting edema, is a clinical finding where the skin indents when pressed, typically indicating fluid accumulation due to venous insufficiency or lymphatic obstruction. However, Sukhia Rani's non-pitting edema suggests a different underlying cause.

**Why the Correct Answer is Right**
The correct answer is related to the pathophysiology of non-pitting edema. Non-pitting edema often results from the accumulation of lymphatic fluid in the interstitial space, which can be caused by obstruction of the lymphatic vessels. In Sukhia Rani's case, the recent onset of non-pitting edema limited to one leg without other symptoms suggests a possible obstruction of the lymphatic vessels in the affected limb. This is a classic presentation of **lymphedema**, which is a chronic and progressive condition often resulting from surgical removal or damage to the lymph nodes, radiation therapy, or genetic conditions.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not directly relate to Sukhia Rani's symptoms. Non-pitting edema is not typically associated with dehydration.
**Option B:** This option is incorrect as it does not specifically address the cause of Sukhia Rani's non-pitting edema. Varicose veins can cause pitting edema, not non-pitting edema.
**Option D:** This option is incorrect as it does not directly relate to Sukhia Rani's symptoms. Obesity can cause pitting edema, not non-pitting edema.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that non-pitting edema can be a sign of an underlying lymphatic obstruction, which may require further evaluation and management to prevent chronic complications.

**Correct Answer:** C.