## Core Concept
Antigen-presenting cells (APCs) are crucial components of the immune system. They process and present antigens to T-cells, activating an immune response. Key APCs include dendritic cells, macrophages, and B lymphocytes.

## Why the Correct Answer is Right
The correct answer, , is not typically classified as an antigen-presenting cell in the traditional sense like dendritic cells, macrophages, and B cells. While it plays a role in the immune response, its primary function is not antigen presentation.

## Why Each Wrong Option is Incorrect
* **Option A:** Dendritic cells are professional antigen-presenting cells and play a critical role in initiating immune responses.
* **Option B:** Macrophages are also professional antigen-presenting cells that engulf and digest cellular debris and pathogens, then present antigens to T-cells.
* **Option C:** B cells can act as antigen-presenting cells, especially when they recognize antigens via their surface-bound antibodies.

## Clinical Pearl / High-Yield Fact
A key point to remember is that while multiple cell types can present antigens, professional APCs like dendritic cells, macrophages, and B cells are highly efficient at activating naive T-cells due to their expression of MHC class I and II molecules and co-stimulatory molecules.

## Correct Answer Line
**Correct Answer: .**