**Core Concept**
Amyloid deposition in the spleen leads to a condition known as lardaceous spleen, characterized by the accumulation of amyloid fibrils in the splenic tissue. This process disrupts the normal architecture and function of the spleen, resulting in its enlargement and softening.

**Why the Correct Answer is Right**
The deposition of amyloid in the spleen is a hallmark of primary amyloidosis, a condition where amyloid fibrils accumulate in various organs, including the spleen, liver, and kidneys. The amyloid fibrils are composed of protein fragments that are deposited in the extracellular space, leading to the disruption of organ function. In the case of lardaceous spleen, the amyloid deposition leads to the enlargement and softening of the spleen, making it palpable and tender.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as lardaceous spleen is not typically associated with secondary amyloidosis, which is a systemic condition that occurs in response to chronic inflammation or infection.

**Option B:** This option is incorrect as lardaceous spleen is not typically associated with hemochromatosis, a genetic disorder that leads to iron overload in the body.

**Option C:** This option is incorrect as lardaceous spleen is not typically associated with Gaucher's disease, a genetic disorder that affects the metabolism of lipids.

**Clinical Pearl / High-Yield Fact**
Lardaceous spleen is a classic example of a systemic amyloidosis, where amyloid deposition occurs in multiple organs, including the spleen, liver, and kidneys.

**Correct Answer:** D.