Commonest ovarian tumour below 20 year of age is –
**Core Concept**
The most common ovarian tumors in young individuals, particularly below the age of 20, are often related to **germ cell tumors**. These tumors arise from the germ cells of the ovary and can be benign or malignant. The **ovarian germ cell tumors** include several subtypes, each with distinct characteristics.
**Why the Correct Answer is Right**
Given the age group, the most common ovarian tumor is likely to be a **germ cell tumor**, specifically a **dysegminoma** or a **mature cystic teratoma**. However, among these, **mature cystic teratoma (dermoid cyst)** is notably common in this age group due to its benign nature and early presentation.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so we cannot assess its accuracy.
**Option B:** Similarly, without the content of Option B, we cannot determine why it might be incorrect.
**Option C:** If this were an option for a different type of tumor, it would be incorrect because the question specifically asks for the most common tumor in individuals under 20.
**Option D:** Again, without the specifics, we cannot say why it's wrong, but if it's not a **germ cell tumor**, it's less likely to be the correct answer for this age group.
**Clinical Pearl / High-Yield Fact**
It's crucial to remember that **mature cystic teratomas (dermoid cysts)** are the most common benign ovarian neoplasms in young women, often presenting with pelvic pain or as an incidental finding on imaging. They are known for containing elements from all three germ layers.
**Correct Answer:** Correct Answer: D. Mature Cystic Teratoma.