**Core Concept**
Intracranial hemorrhage refers to bleeding within the skull, which can be caused by various factors such as hypertension, trauma, or vascular malformations. The most common type of intracranial hemorrhage is intracerebral hemorrhage, which occurs within the brain parenchyma.

**Why the Correct Answer is Right**
Intracerebral hemorrhage is the most common type of intracranial hemorrhage, accounting for approximately 10-15% of all strokes. This is due to the fact that small, deep cerebral arteries are prone to rupture, leading to bleeding within the brain tissue. The blood vessels in the brain are under high pressure, and even small increases in pressure can cause these vessels to rupture. The most common location for intracerebral hemorrhage is the basal ganglia, followed by the thalamus and pons.

**Why Each Wrong Option is Incorrect**
**Option A:** Subarachnoid hemorrhage is actually the most common cause of non-traumatic subarachnoid hemorrhage, but not the most common cause of intracranial hemorrhage overall.
**Option C:** Subdural hemorrhage is more common in children and elderly patients, typically as a result of trauma or anticoagulation, but not as common as intracerebral hemorrhage.
**Option D:** Extradural hemorrhage is a type of hemorrhage that occurs between the dura mater and the skull, often as a result of trauma, but is less common than intracerebral hemorrhage.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that intracerebral hemorrhage is often associated with hypertension, and patients with uncontrolled hypertension are at higher risk of developing this condition. Furthermore, intracerebral hemorrhage is a medical emergency that requires prompt recognition and treatment to prevent further brain damage.

**✓ Correct Answer: B. Intracerebral haemorrhage**