**Question:** Most common germ cell ovarian tumor:

A. Brenner tumor
B. Brenner tumor
C. Dermoid cyst
D. Seminoma

**Core Concept:** Germ cell tumors are a group of neoplasms that originate from germ cells, which are the precursor cells that develop into gametes (sperm and egg cells). In the female reproductive system, the most common site for germ cell tumors is the ovaries.

**Why the Correct Answer is Right:** Dermoid cyst is a type of germ cell tumor but is less common compared to seminoma, which is a pure germ cell tumor consisting of mature sperm cells.

**Clinical Pearl:** Seminomas are often associated with a low-grade malignancy and a better prognosis compared to other ovarian tumors.

**Why Each Wrong Option is Incorrect:**

A. Brenner tumor: This is a benign tumor that develops from the stromal cells of the ovary and is not a germ cell tumor.
B. Brenner tumor: Same explanation as above, using the correct spelling "Brenner" for the tumor type.

**Correct Answer:** D. Seminoma