**Core Concept**
The formation of granulomas is a key aspect of the body's immune response to certain types of infections and foreign substances. In granulomatous inflammation, a specific type of immune cell, the **macrophage**, plays a central role in the formation and maintenance of granulomas.

**Why the Correct Answer is Right**
The macrophage is the principle cell in granuloma due to its ability to engulf and digest foreign particles and microorganisms. Macrophages undergo a transformation into **epithelioid cells**, which then fuse together to form **giant cells**. This process is crucial in containing and eliminating pathogens, such as Mycobacterium tuberculosis, which causes tuberculosis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as **lymphocytes**, such as T cells and B cells, play a supportive role in granulomatous inflammation but are not the principle cell.
**Option B:** This option is incorrect as **eosinophils** are involved in allergic reactions and parasitic infections, not granulomatous inflammation.
**Option C:** This option is incorrect as **neutrophils** are primarily involved in acute inflammatory responses, not granulomatous inflammation.

**Clinical Pearl / High-Yield Fact**
Granulomatous inflammation is a hallmark of chronic infections, such as tuberculosis and histoplasmosis, and is also seen in autoimmune conditions like sarcoidosis.

**Correct Answer:** C. Macrophage