**Core Concept**
The administration of fresh frozen plasma (FFP) is based on the principle of replacing coagulation factors in patients with coagulopathy or bleeding disorders. FFP contains all clotting factors, which are essential for the coagulation cascade and formation of a stable blood clot.

**Why the Correct Answer is Right**
FFP is used to correct coagulopathy caused by liver disease, warfarin overdose, or dilutional coagulopathy due to massive transfusion. The coagulation cascade involves several enzyme-substrate reactions, which are catalyzed by clotting factors present in FFP. The administration of FFP replenishes these clotting factors, thereby restoring the coagulation pathway and preventing further bleeding.

* FFP is also used in patients with disseminated intravascular coagulation (DIC), where the consumption of clotting factors leads to a coagulopathy.
* Additionally, FFP may be used as a volume expander in patients with severe bleeding, particularly when crystalloids and colloids are insufficient.

**Why Each Wrong Option is Incorrect**

* **Option A:** FFP is not used as a substitute for whole blood in patients with anemia. While FFP may contain some red blood cells, it is not a suitable replacement for whole blood, which contains all blood components, including red blood cells, white blood cells, and platelets.
* **Option B:** FFP is not used to treat thrombocytopenia. Thrombocytopenia is a condition characterized by low platelet count, and FFP does not contain platelets. Platelet transfusions are used to treat thrombocytopenia.
* **Option C:** FFP is not used as a volume expander in patients with normal coagulation status. While FFP may be used as a volume expander in patients with severe bleeding, it is not necessary in patients with normal coagulation status, where crystalloids and colloids are sufficient.

**Clinical Pearl / High-Yield Fact**
When administering FFP, it is essential to consider the volume of FFP required to correct coagulopathy. A general rule of thumb is to administer 10-15 mL/kg of FFP, which is equivalent to 1-1.5 units of FFP for an average adult patient.

**Correct Answer: D.**