**Core Concept**
The diagnosis of various ocular and systemic conditions is made possible through a comprehensive fundus examination. The fundus, comprising the retina, optic disc, macula, and retinal vessels, is examined to identify signs of disease, such as neovascularization, hemorrhages, or optic disc edema. A thorough fundus examination is crucial for diagnosing conditions like diabetic retinopathy, hypertensive retinopathy, and retinal detachment.

**Why the Correct Answer is Right**
The correct answer is based on the identification of specific signs on fundus examination. For instance, the presence of cotton wool spots, flame-shaped hemorrhages, and arteriolar narrowing are characteristic of hypertensive retinopathy. In contrast, diabetic retinopathy is marked by microaneurysms, retinal hemorrhages, and neovascularization. The optic disc is also examined for signs of optic disc edema or atrophy. The correct answer will accurately reflect the clinical findings on fundus examination.

**Why Each Wrong Option is Incorrect**
**Option A:** A normal fundus examination with no signs of disease is incorrect because a comprehensive fundus examination is essential for detecting subtle signs of ocular or systemic conditions.

**Option B:** A fundus examination showing only a few scattered retinal hemorrhages is incorrect because diabetic retinopathy typically presents with a more extensive retinal hemorrhage pattern, microaneurysms, and neovascularization.

**Option C:** A fundus examination showing only optic disc edema is incorrect because optic disc edema can be a sign of various conditions, including papilledema, ischemic optic neuropathy, or optic neuritis.

**Clinical Pearl / High-Yield Fact**
A thorough fundus examination is essential for detecting subtle signs of ocular and systemic conditions, and it should be performed in all patients with a history of hypertension, diabetes, or other systemic diseases.

**Correct Answer:** D.