**Core Concept**
Primary amenorrhea in a 16-year-old female with raised FSH levels indicates a disorder of ovarian function, specifically premature ovarian failure or insensitivity to gonadotropins. This condition leads to a lack of estrogen production, causing a feedback loop that results in elevated follicle-stimulating hormone (FSH) levels.

**Why the Correct Answer is Right**
The histopathological finding in this case is the absence of oocytes in the ovaries, also known as streak ovaries. This is due to the premature depletion of ovarian follicles, leading to a reduction in estrogen production and an increase in FSH levels. The ovaries appear as thin, fibrotic streaks rather than the normal ovarian tissue. The absence of oocytes and follicles is a hallmark of premature ovarian failure.

**Why Each Wrong Option is Incorrect**
**Option B:** Mucinous cystadenoma is a type of ovarian tumor, which is not consistent with the clinical presentation of primary amenorrhea and raised FSH levels.

**Option C:** Psammoma bodies are small, calcified structures found in certain types of ovarian tumors, such as serous cystadenocarcinomas. They are not associated with the histopathological findings in this case.

**Option D:** Hemorrhagic Corpus Luteum refers to a complication of ovarian cysts, where a hemorrhagic cyst forms in the ovary. This is not related to the primary amenorrhea and raised FSH levels in this patient.

**Clinical Pearl / High-Yield Fact**
In cases of primary amenorrhea with raised FSH levels, it is essential to consider the possibility of premature ovarian failure or insensitivity to gonadotropins. A careful physical examination, including measurement of height, can provide clues to the underlying diagnosis, as in this case where the patient's short stature (58 inches) suggests Turner syndrome, a common cause of premature ovarian failure.

**✓ Correct Answer: A. Absence of oocytes in the ovaries (streak ovaries)**