**Core Concept**
Hypertensive retinopathy is a condition characterized by changes in the retina due to high blood pressure. It is a manifestation of systemic hypertension affecting the small blood vessels in the retina. Cotton wool spots are a specific type of retinal hemorrhage associated with hypertensive retinopathy.

**Why the Correct Answer is Right**
Cotton wool spots are formed due to the occlusion of small retinal arterioles, leading to ischemia and infarction of the nerve fiber layer. This results in the accumulation of axoplasmic debris, which appears as fluffy white spots on fundoscopic examination. The presence of cotton wool spots is a sign of severe hypertensive retinopathy and indicates damage to the small blood vessels in the retina.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as cotton wool spots are not typically associated with diabetic retinopathy, which is characterized by microaneurysms, hemorrhages, and lipid exudates.
* **Option B:** This option is incorrect as retinal vein occlusion is a different condition that affects the retinal veins, leading to hemorrhages and ischemia, but not typically cotton wool spots.
* **Option D:** This option is incorrect as age-related macular degeneration is a condition affecting the macula, leading to atrophy and scarring, but not typically cotton wool spots.

**Clinical Pearl / High-Yield Fact**
Cotton wool spots can be a sign of severe hypertensive retinopathy and indicate a high risk of vision loss. Early detection and management of hypertension can prevent the progression of hypertensive retinopathy and reduce the risk of complications.

**Correct Answer:** C. Cotton wool spots are a characteristic finding in hypertensive retinopathy, particularly in severe cases.