**Core Concept**
Fibrinogen degradation products (FDPs) are fragments produced during the breakdown of fibrinogen, a glycoprotein essential for blood coagulation. These products accumulate in the blood following a thrombotic event or disseminated intravascular coagulation (DIC).

**Why the Correct Answer is Right**
FDPs, particularly D-dimer, are elevated in conditions involving fibrin degradation. D-dimer is a specific marker for thrombosis and is used to diagnose conditions such as deep vein thrombosis (DVT) and pulmonary embolism (PE). FDPs can also be used to monitor the progression of thrombotic disorders and assess the effectiveness of treatment.

**Why Each Wrong Option is Incorrect**
**Option A:**
FDPs are not directly involved in the detection of atherosclerosis. While atherosclerosis is a condition that can lead to thrombosis, FDPs are not a primary marker for this condition.

**Option B:**
FDPs are not used to detect infections. While infections can trigger DIC, FDPs are not a primary marker for infection detection.

**Option C:**
FDPs are not used to detect liver disease. While liver dysfunction can affect coagulation, FDPs are not a primary marker for liver disease.

**Clinical Pearl / High-Yield Fact**
FDPs, particularly D-dimer, are a rapid and sensitive marker for thrombosis, making them a valuable tool in the diagnosis of conditions such as DVT and PE.

**Correct Answer:** D. Detection of thrombotic disorders.