**Core Concept**
Marshal's triad, also known as the "explosive triad," is a set of three critical components that contribute to the severe injuries and complications seen in patients who have sustained a blast injury, such as a bomb blast explosion. These components include primary, secondary, and tertiary injuries. Primary injuries involve the initial blast wave causing damage to the lungs, ears, and gastrointestinal tract. Secondary injuries are caused by flying debris and shrapnel. Tertiary injuries occur when the patient is thrown against an object, causing blunt trauma.

**Why the Correct Answer is Right**
The correct answer is not a component of Marshal's triad. Marshal's triad specifically refers to primary, secondary, and tertiary blast injuries. The correct answer is not one of these components.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because primary blast injuries are indeed a component of Marshal's triad, involving damage to the lungs, ears, and gastrointestinal tract from the initial blast wave.
**Option B:** This option is incorrect because secondary blast injuries, caused by flying debris and shrapnel, are a component of Marshal's triad.
**Option C:** This option is incorrect because tertiary blast injuries, resulting from blunt trauma when the patient is thrown against an object, are a component of Marshal's triad.
**Option D:** This option is the correct answer because it is not a component of Marshal's triad.

**Clinical Pearl / High-Yield Fact**
In blast injuries, the primary blast wave can cause damage to the lungs, ears, and gastrointestinal tract, leading to severe respiratory distress, hearing loss, and gastrointestinal bleeding. This is due to the rapid increase and decrease in pressure caused by the blast wave.

**Correct Answer:** D.