**Core Concept:** Migraine is a primary headache disorder characterized by recurrent headaches and associated symptoms. It is often unilateral (one-sided) and can be accompanied by nausea, vomiting, and sensory disturbances.

**Why the Correct Answer is Right:** The correct answer, migraine (Option C), is a primary headache disorder characterized by recurrent and typically unilateral headaches. The other options are either secondary causes of headache or do not fit the described symptoms perfectly.

**Why Each Wrong Option is Incorrect:**

A. Tension headache (Option A) is usually bilateral, not causing paresthesia, and is associated with muscle tension rather than nausea and vomiting.
B. Cluster headache (Option B) is a rare and severe headache type with pulsating pain, usually around one eye, not affecting an entire hemicranium.
D. Subarachnoid haemorrhage (Option D) is an emergency condition caused by bleeding into the subarachnoid space, presenting with severe headache, rather than episodic headaches.

**Clinical Pearl / High-Yield Fact:** Migraine is often familial and can be managed with preventive medications and acute treatments. Patients should be educated about the disease, lifestyle modifications, and stress management for better control of symptoms.

**Correct Answer:** Migraine (Option C) is the correct answer due to the patient's described symptoms of episodic headaches, left hemicranium involvement, and accompanying nausea and paresthesia of the right upper and lower limbs.