**Core Concept**
Fibroids, also known as uterine leiomyomas, are benign tumors that originate from the smooth muscle layer of the uterus. They can vary in size and number and are influenced by hormonal factors, particularly estrogen.

**Why the Correct Answer is Right**
Fibroids grow in response to estrogen stimulation, which promotes cell proliferation and tumor growth. The correct answer is related to the pathophysiology of fibroid growth and the role of estrogen. Estrogen receptors are present in fibroid tissue, and the binding of estrogen to these receptors triggers the activation of various signaling pathways that lead to cell growth and proliferation. This estrogen-dependent growth is a key factor in the development and progression of fibroids.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the relationship between fibroids and estrogen. While fibroids do grow in response to estrogen, they are not directly caused by estrogen deficiency.
**Option B:** This option is incorrect because it implies that fibroids are a result of progesterone imbalance, which is not supported by evidence. Fibroids are more closely associated with estrogen levels than progesterone levels.
**Option C:** This option is incorrect because it suggests that fibroids are a result of genetic mutations, which is not a primary cause of fibroids. While genetic factors may contribute to the development of fibroids, they are not the primary driver of fibroid growth.

**Clinical Pearl / High-Yield Fact**
Fibroids are the most common pelvic tumors in women of reproductive age, and their growth is influenced by hormonal factors, particularly estrogen. This knowledge is essential for clinicians to understand the pathophysiology of fibroids and develop effective treatment strategies.

**Correct Answer:** C.