**Core Concept**
Dalen-Fuchs nodules are a type of inflammatory lesion found in the retina, associated with autoimmune uveitis, particularly in the context of sympathetic ophthalmia and uveitis associated with sarcoidosis.

**Why the Correct Answer is Right**
Dalen-Fuchs nodules are formed by the aggregation of epithelioid cells and lymphocytes between the retinal pigment epithelium (RPE) and Bruch's membrane. This process is thought to be a result of the autoimmune response against the RPE, leading to the release of pro-inflammatory cytokines and the recruitment of immune cells. The presence of these nodules is a hallmark of chronic and severe uveitis, often indicating a poor prognosis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to Dalen-Fuchs nodules, as they are not associated with the formation of granulomas in the choroid or the retina.

**Option B:** While sympathetic ophthalmia is a correct association, it is not the only condition where Dalen-Fuchs nodules are seen. They can also be found in other forms of autoimmune uveitis, such as sarcoidosis.

**Option C:** This option is incorrect as Dalen-Fuchs nodules are not a feature of infectious uveitis, such as toxoplasmosis or endophthalmitis.

**Clinical Pearl / High-Yield Fact**
Dalen-Fuchs nodules are a critical diagnostic feature in the evaluation of uveitis, particularly in cases of chronic and severe inflammation. They are often associated with a poor visual outcome and may require aggressive immunosuppressive therapy to manage.

**Correct Answer:** B. Sympathetic ophthalmia and sarcoidosis.