## Core Concept
The question revolves around the management of a woman with a known **BRCA1 mutation**, which significantly increases the risk of breast and ovarian cancer. The patient has a family history of ovarian cancer and is seeking to reduce her risk. **BRCA1 and BRCA2** are genes that produce proteins responsible for repairing damaged DNA and, therefore, play a crucial role in maintaining the stability of a cell's genetic material.

## Why the Correct Answer is Right
The correct answer, **Bilateral Salpingo-Oophorectomy (BSO)**, is recommended for women with a **BRCA1 or BRCA2 mutation** to significantly reduce the risk of ovarian cancer. This surgical procedure involves the removal of both ovaries and fallopian tubes. The risk of ovarian cancer in **BRCA1** mutation carriers is substantially higher than in the general population, and **BSO** can reduce this risk by up to 90-95%. Given the patient's family history and her mutation status, this option provides a proactive approach to cancer prevention.

## Why Each Wrong Option is Incorrect
- **Option A: Mastectomy** - While mastectomy can reduce the risk of breast cancer in **BRCA1** and **BRCA2** mutation carriers, it does not address the risk of ovarian cancer.
- **Option C: Hysterectomy** - A hysterectomy involves the removal of the uterus and does not directly impact the risk of ovarian cancer since the ovaries are left intact.
- **Option D: Tubal ligation** - This procedure involves blocking or severing the fallopian tubes to prevent pregnancy and offers some reduction in ovarian cancer risk but is not as effective as **BSO** in reducing ovarian cancer risk in **BRCA1** mutation carriers.

## Clinical Pearl / High-Yield Fact
A key point to remember is that **BSO** is considered for women with **BRCA1 or BRCA2 mutations**, especially when there's a significant family history of breast or ovarian cancer. However, this decision should be made after thorough counseling regarding the implications of early menopause and the potential need for hormone replacement therapy.

## Correct Answer: B. Bilateral Salpingo-Oophorectomy.