**Core Concept**
Exudative retinal detachment occurs when retinal fluid accumulates due to leakage from underlying vascular or inflammatory processes, rather than a mechanical tear. It is primarily caused by vitreous or subretinal fluid accumulation from pathological processes like inflammation, systemic diseases, or vascular abnormalities.

**Why the Correct Answer is Right**
Scleritis (A) can lead to severe inflammation of the sclera, causing vitritis and subretinal fluid accumulation, thus contributing to exudative detachment. Toxaemia of pregnancy (B), particularly in preeclampsia, is associated with systemic inflammation and vascular leakage, leading to retinal edema and exudative detachment. Central serous retinopathy (C) involves leakage of fluid from the retina due to choroidal circulation dysfunction, resulting in subretinal fluid and detachment. All these conditions promote fluid accumulation on the retinal surface, fulfilling the definition of exudative detachment.

**Why Each Wrong Option is Incorrect**
Option A: Scleritis is a rare but potent cause of inflammatory exudative detachment; it is not a distractor here because it is indeed a valid cause.
Option B: Toxaemia of pregnancy is a well-documented cause of exudative retinal detachment due to systemic vascular changes.
Option C: Central serous retinopathy is a classic exudative retinal detachment cause due to choroidal venous congestion and leakage.
(Note: All are valid causes — hence D is correct.)

**Clinical Pearl / High-Yield Fact**
Exudative retinal detachment is often linked to systemic disease or inflammation. Always consider pregnancy-related toxaemia, autoimmune conditions, or central serous retinopathy in patients with subretinal fluid, especially in young adults or during gestation.

✓ Correct Answer: D. All