## **Core Concept**
Blast injuries result from the rapid release of energy, typically from an explosion, causing damage through shockwaves, flying debris, and environmental hazards. The primary blast wave, a high-pressure shockwave, can cause significant damage to air-filled organs.

## **Why the Correct Answer is Right**
The correct answer, **C. Liver**, is right because the liver, being a solid organ without air-filled spaces, is less susceptible to primary blast injuries compared to air-filled organs like the lungs, gastrointestinal tract, and middle ear. The primary blast wave's damage is most pronounced in organs with air-tissue interfaces.

## **Why Each Wrong Option is Incorrect**
- **Option A:** The lungs are highly susceptible to blast injuries due to their air-filled alveoli, which can rupture or suffer barotrauma from the shockwave.
- **Option B:** The gastrointestinal tract, also air-filled, is vulnerable to blast injuries, with potential for bowel rupture or hemorrhage due to the shockwave.
- **Option D:** The middle ear, being an air-filled structure, is very sensitive to pressure changes and can easily suffer damage from blast overpressures.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that blast injuries can cause significant damage to air-filled organs, and the pattern of injury often reflects the mechanism of the blast. Solid organs like the liver are less likely to be directly injured by the primary blast wave but can be injured by secondary effects like flying debris or tertiary effects like being thrown.

## **Correct Answer:** . Liver