Tumor marker of Dysgerminoma
**Core Concept**
Dysgerminoma is a type of germ cell tumor that primarily affects the ovary. It is the most common malignant ovarian tumor in young women. The tumor marker of dysgerminoma is a serum protein that helps in the diagnosis and monitoring of the disease.
**Why the Correct Answer is Right**
Beta-human chorionic gonadotropin (β-hCG) is not specific to dysgerminoma, and alpha-fetoprotein (AFP) is more commonly associated with yolk sac tumors. However, the tumor marker specifically associated with dysgerminoma is lactate dehydrogenase (LDH), but more specifically, the correct answer is LDH, but the question specifically asks for a 'tumor marker', which is more accurately represented by the correct answer.
**Why Each Wrong Option is Incorrect**
**Option A:** Beta-human chorionic gonadotropin (β-hCG) is not specific to dysgerminoma and is more commonly associated with choriocarcinoma.
**Option B:** Alpha-fetoprotein (AFP) is more commonly associated with yolk sac tumors.
**Option C:** This option is incorrect as there is no information regarding this option being a tumor marker for dysgerminoma.
**Clinical Pearl / High-Yield Fact**
It is essential to remember that LDH levels are not specific to dysgerminoma, but rather, the question is looking for a 'tumor marker', which LDH is not typically considered as.
**Correct Answer: D.**