**Core Concept**
Extradural hematoma is a type of traumatic brain injury characterized by the accumulation of blood between the dura mater and the skull. This condition is often the result of a severe head trauma, typically a fall or a motor vehicle accident, which leads to a fracture in the skull.

**Why the Correct Answer is Right**
The correct answer is based on the association between extradural hematoma and severe trauma. Extradural hematoma is a potentially life-threatening condition that requires prompt medical attention. The bleeding in extradural hematoma is usually due to the injury of the middle meningeal artery, which is located between the dura mater and the skull. The incidence of extradural hematoma in severe trauma is significant, and it is considered a medical emergency.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not provide a specific percentage, making it difficult to evaluate its accuracy.
**Option B:** This option is incorrect because it does not specify the correct percentage, and extradural hematoma is not typically associated with a low percentage of severe trauma.
**Option C:** This option is incorrect because the actual percentage of extradural hematoma in severe trauma is higher than the one mentioned.

**Clinical Pearl / High-Yield Fact**
Extradural hematoma is a medical emergency that requires prompt surgical intervention to relieve the pressure on the brain and prevent further damage. The key to managing extradural hematoma is timely diagnosis and treatment.

**Correct Answer:** 4. 5%