## **Core Concept**
The question tests the understanding of the role of the spleen in filtering the blood and its impact on blood cell populations. The spleen is responsible for filtering the blood, storing red blood cells, and serving as a reservoir for immune cells. After splenectomy, certain cell types may increase in the peripheral blood due to the loss of splenic function.

## **Why the Correct Answer is Right**
The correct answer, **Howell-Jolly bodies** or more accurately in this context, the cell type that increases, is related to the absence of the spleen's filtering function. Normally, the spleen removes old, damaged red blood cells and inclusions from the circulation. One of the key changes following splenectomy is the presence of **target cells** and ** Howell-Jolly bodies** in the peripheral smear, but specifically, the cell type that increases and is often associated with asplenia (absence of spleen) is **pitted red blood cells** or more directly related to the options, there is an increase in **red blood cells with inclusions** like Howell-Jolly bodies. However, among the provided options and focusing on cell types, **Reticulocytes** might not directly be the best answer here but focusing on changes, **Platelets** increase.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Incorrect because while there might be some changes in white blood cell counts, the most direct and commonly acknowledged change isn't specified here.
- **Option B:** Incorrect because although changes in differential counts can occur, the specific notable increase isn't best represented here.
- **Option C:** Incorrect as it's not directly related to the commonly acknowledged significant increase post-splenectomy.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that patients without a spleen (asplenic patients) are at increased risk of infections, particularly those caused by encapsulated organisms. Moreover, peripheral blood smears from asplenic patients often show characteristic changes, including the presence of Howell-Jolly bodies.

## **Correct Answer:** .