**Core Concept**
Fibroids, also known as uterine leiomyomas, are benign tumors arising from the smooth muscle layer of the uterus. They are a common cause of abnormal uterine bleeding and pelvic pain in women of reproductive age.

**Why the Correct Answer is Right**
Fibroids are typically characterized by their growth in a well-defined capsule, with a smooth surface. They can be classified into three types based on their location: intramural (within the uterine wall), submucosal (projecting into the uterine cavity), and subserosal (projecting into the uterine pelvis). The growth of fibroids is influenced by estrogen and progesterone, leading to an increase in their size during the reproductive years.

**Why Each Wrong Option is Incorrect**
**Option A:** *Not provided*
**Option B:** *Not provided*
**Option C:** *Not provided*
**Option D:** *Not provided*

**Clinical Pearl / High-Yield Fact**
Fibroids are more common in women of African descent and are often associated with a family history of fibroids. They can cause a range of symptoms, including heavy menstrual bleeding, pelvic pressure, and infertility.

**Correct Answer: D.**