**Core Concept**
Call-Exner bodies are a characteristic histopathological feature seen in certain ovarian neoplasms. They are small, fluid-filled spaces or cystic structures within the tumor, often surrounded by granulosa cells. This phenomenon is related to the pathophysiology of sex cord-stromal tumors.

**Why the Correct Answer is Right**
Call-Exner bodies are typically seen in granulosa cell tumors of the ovary. These tumors arise from the sex cord-stromal cells of the ovary and are characterized by their ability to produce estrogen. The formation of Call-Exner bodies is thought to be due to the accumulation of fluid within the tumor, which is often associated with the presence of granulosa cells. The granulosa cells surrounding these spaces may produce factors that contribute to the fluid accumulation.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as Call-Exner bodies are not typically seen in Brenner tumors, which are a type of transitional cell carcinoma of the ovary.
**Option B:** This option is incorrect as Call-Exner bodies are not a characteristic feature of epithelial ovarian cancers, such as serous or mucinous carcinomas.
**Option C:** This option is incorrect as Call-Exner bodies are not typically seen in teratomas, which are a type of germ cell tumor of the ovary.

**Clinical Pearl / High-Yield Fact**
The presence of Call-Exner bodies in an ovarian tumor can be a useful diagnostic clue, as they are a characteristic feature of granulosa cell tumors. These tumors can produce estrogen, leading to symptoms such as precocious puberty in children or endometrial hyperplasia in adults.

**Correct Answer:** D. Granulosa cell tumors.