## **Core Concept**
The question tests knowledge of neurological disorders, specifically those that cause headache and limb paresthesias. Paresthesias refer to abnormal sensations such as tingling, numbness, or prickling. The symptoms described suggest a condition affecting the brain or its coverings.

## **Why the Correct Answer is Right**
The correct answer, **C. Migraine with aura**, is the most likely diagnosis. Migraine with aura is a subtype of migraine that includes transient neurological symptoms (aura) before the headache phase. Aura symptoms can include visual disturbances, sensory disturbances (like paresthesias), and even motor weakness. The presence of headache associated with paresthesias of the right upper and lower limb suggests a spreading cortical depression or a similar pathophysiological mechanism typical of migraine aura.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, conditions like tension headaches do not usually cause limb paresthesias.
- **Option B:** This option is also not provided, but disorders such as transient ischemic attacks (TIAs) or strokes could cause limb paresthesias but are usually not associated with headache.
- **Option D:** Similarly, this option is not specified, but conditions like multiple sclerosis could cause a wide range of neurological symptoms; however, the combination of headache and unilateral limb paresthesias points more towards a migraine with aura.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that migraine with aura often starts with visual symptoms (like scintillating scotomas) followed by sensory symptoms. The presence of headache with neurological symptoms like paresthesias should prompt consideration of migraine with aura, especially if the symptoms are transient and resolve completely.

## **Correct Answer: C. Migraine with aura**