**Core Concept**
The question is testing the student's ability to identify a specific type of lymphoma based on histopathological findings. The underlying concept is the distinction between different types of non-Hodgkin lymphoma (NHL) and their characteristic features.

**Why the Correct Answer is Right**
The lymph node biopsy likely shows a mixture of lymphocytes and plasma cells, with a background of reactive lymphoid follicles. This is consistent with a diagnosis of **Burkitt lymphoma**, a high-grade B-cell lymphoma characterized by a specific translocation involving the MYC gene. The presence of cervical lymphadenopathy and a long history of cough suggest lymphoma as a possible cause, and the histopathological features are consistent with Burkitt lymphoma.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is likely a distractor, as the histopathological features described do not match the typical presentation of **Follicular lymphoma**, which is a different type of NHL.
* **Option B:** **Diffuse large B-cell lymphoma** is another type of NHL, but the presence of reactive lymphoid follicles and a mixture of lymphocytes and plasma cells is not typical for this diagnosis.
* **Option C:** **Hodgkin lymphoma** is a different type of lymphoma, characterized by the presence of Reed-Sternberg cells, which are not described in the biopsy findings.

**Clinical Pearl / High-Yield Fact**
Burkitt lymphoma is a highly aggressive type of lymphoma that requires prompt treatment. It is often associated with a characteristic translocation involving the MYC gene, and the presence of this translocation can be used as a diagnostic marker.

**Correct Answer:** C.