Drug of choice for cytomegalovirus retinitis in HIV patients is:-
**Core Concept**
The underlying principle being tested is the management of **cytomegalovirus (CMV) retinitis** in immunocompromised patients, specifically those with **HIV/AIDS**. CMV retinitis is a serious infection that can lead to blindness if left untreated. **Antiviral medications** are the mainstay of treatment.
**Why the Correct Answer is Right**
The correct answer is based on the efficacy and safety profile of **Ganciclovir** (or its prodrug **Valganciclovir**) in treating CMV retinitis. Ganciclovir works by inhibiting the **CMV DNA polymerase**, thereby preventing viral replication. It is administered via intravenous or intravitreal routes for localized treatment.
**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because **Foscarnet** is an alternative treatment, not the first-line choice.
**Option B:** Incorrect as **Cidofovir** has a role but is not the preferred initial treatment due to its side effect profile.
**Option D:** Incorrect because while **Fomivirsen** is an antiviral, it's not the primary choice for CMV retinitis in HIV patients.
**Clinical Pearl / High-Yield Fact**
Remember, **Ganciclovir** is the drug of choice for CMV retinitis, especially in HIV patients, due to its effectiveness and relatively favorable side effect profile compared to other antivirals.
**Correct Answer:** D. Ganciclovir.