**Core Concept**
Trauma from occlusion is a phenomenon related to the sudden release of pressure within a closed system, such as a blood vessel or the eye. This release can cause damage to the surrounding tissues due to the rapid increase in pressure.

**Why the Correct Answer is Right**
The correct answer is related to the concept of **Valsalva maneuver**, which involves forced exhalation against a closed airway. In the context of occlusion, the sudden release of pressure can lead to **expulsive hemorrhage**, where blood is forced out of a closed vessel, causing trauma to the surrounding tissues. This is often seen in cases of **rhegmatogenous retinal detachment** or **subconjunctival hemorrhage**.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it is unrelated to the concept of trauma from occlusion.
* **Option B:** This option is incorrect as it refers to a different phenomenon, where a decrease in pressure causes damage to tissues.
* **Option C:** This option is incorrect as it refers to a different type of injury, where tissues are damaged due to a lack of blood flow.

**Clinical Pearl / High-Yield Fact**
Remember that trauma from occlusion can occur in any closed system, including blood vessels, the eye, and the lungs. It is essential to recognize the signs and symptoms of expulsive hemorrhage, such as sudden vision loss, pain, and redness.

**Correct Answer: C. Expulsive hemorrhage.**