**Core Concept**
The patient's symptoms, such as visual disturbances, bilateral retinal exudates, and perivascular hemorrhages, are characteristic of a specific form of viral retinitis. This condition is a common opportunistic infection in HIV/AIDS patients, occurring when the immune system is severely compromised.

**Why the Correct Answer is Right**
The most likely virus responsible for this retinitis is Cytomegalovirus (CMV). CMV retinitis is a condition where the virus infects the retina, causing inflammation and damage. It is a major cause of vision loss in HIV/AIDS patients, particularly those with low CD4 counts. CMV retinitis is characterized by the presence of perivascular hemorrhages and retinal exudates, which are consistent with the patient's fundal examination findings. The virus targets the retinal pigment epithelium and the outer retinal layers, leading to the characteristic lesions.

**Why Each Wrong Option is Incorrect**
* **Option A:** Herpes Simplex Virus (HSV) is not typically associated with retinitis in HIV patients. HSV can cause other ocular infections, such as keratitis and uveitis, but it is not the primary cause of CMV-like retinitis.
* **Option B:** Varicella-Zoster Virus (VZV) is the cause of shingles and can cause ocular complications, but it is not typically associated with retinitis in HIV patients.
* **Option D:** Adenovirus can cause various ocular infections, including conjunctivitis and keratitis, but it is not typically associated with retinitis in HIV patients.

**Clinical Pearl / High-Yield Fact**
In HIV/AIDS patients, CMV retinitis is a medical emergency that requires prompt treatment to prevent vision loss. The diagnosis is typically made through a combination of clinical examination, retinal imaging, and laboratory tests. Treatment options include antiviral medications, such as ganciclovir and foscarnet, which can help manage the condition and prevent further vision loss.

**Correct Answer: C. Cytomegalovirus (CMV)**