**Question:** Which of the following drugs deposited in the retina is responsible for the characteristic fundus changes in diabetic retinopathy?

**Core Concept:** Diabetic retinopathy is a complication of diabetes mellitus affecting the retina. Deposition of advanced glycation end-products (AGEs) leads to retinal changes due to increased oxidative stress and inflammation.

**Why the Correct Answer is Right:** Vitamin E is an antioxidant, which helps protect against oxidative damage caused by AGEs. Deposition of Vitamin E in the retina would indicate its role in neutralizing free radicals and reducing the damage caused by AGEs.

**Why Each Wrong Option is Incorrect:**

A. Vitamin C: Although an antioxidant, it is not specifically involved in neutralizing AGEs or their effects on the retina.

B. Vitamin D: This vitamin has no direct relation to AGEs or diabetic retinopathy.

C. Vitamin A: While essential for vision, Vitamin A is not directly involved in AGEs-related retinal damage.

D. Vitamin K: This vitamin is essential for blood clotting but does not contribute to the retinal protection against AGEs.

**Clinical Pearl:** Diabetic retinopathy is a common complication of diabetes mellitus, leading to vision impairment and blindness if left untreated. Understanding the role of antioxidants like Vitamin E in preventing AGE-induced retinal damage is crucial for early intervention and management of this condition.

**Correct Answer:** Vitamin E (Alpha-tocopherol)

**Explanation:** Vitamin E is a potent antioxidant, particularly effective in neutralizing free radicals and reducing oxidative stress caused by advanced glycation end-products (AGEs) in diabetic retinopathy. Deposition of Vitamin E in the retina indicates its role in protecting against AGE-induced damage, thereby preventing the characteristic fundus changes seen in diabetic retinopathy.