**Core Concept**
TB lymphadenitis, also known as tuberculous lymphadenitis, is a form of extrapulmonary tuberculosis characterized by the involvement of lymph nodes. In HIV-positive individuals, the immune system is compromised, increasing the susceptibility to opportunistic infections like TB.

**Why the Correct Answer is Right**
TB lymphadenitis in HIV-positive patients often presents with chronic symptoms, such as cough and lymphadenopathy. The immune response in these patients is usually impaired, making it difficult for the body to contain the infection. Surgical biopsy is a definitive diagnostic tool for TB lymphadenitis, allowing for the collection of tissue samples for histopathological examination. In this case, the diagnosis was TB lymphadenitis, indicating that the patient's immune system was unable to control the TB infection.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not provide any relevant information about the patient's condition.
**Option B:** This option is incorrect as it does not accurately describe the patient's symptoms or the diagnosis of TB lymphadenitis.
**Option C:** This option is incorrect as it is not directly related to the diagnosis of TB lymphadenitis.

**Clinical Pearl / High-Yield Fact**
In HIV-positive patients with chronic symptoms and lymphadenopathy, TB lymphadenitis should be a primary consideration in the differential diagnosis. A high index of suspicion and prompt diagnostic workup, including surgical biopsy, are essential for accurate diagnosis and treatment.

**Correct Answer: None provided. However, a suitable answer could be "TB lymphadenitis is a common opportunistic infection in HIV-positive patients, often presenting with chronic symptoms and lymphadenopathy."**