**Core Concept**
Adenomyosis is a gynecological condition characterized by the presence of endometrial tissue within the myometrium, leading to symptoms such as heavy menstrual bleeding, pelvic pain, and dysmenorrhea. The definitive treatment aims to alleviate these symptoms and improve quality of life.

**Why the Correct Answer is Right**
The definitive treatment of choice for adenomyosis is **hysterectomy**, which involves the surgical removal of the uterus. This approach is effective in eliminating the symptoms associated with adenomyosis, as it removes the affected tissue. Hysterectomy can be performed via an open incision or laparoscopically. The decision to undergo hysterectomy is typically made after conservative management options, such as hormonal therapy and uterine artery embolization, have failed to provide adequate relief.

**Why Each Wrong Option is Incorrect**
**Option A:** Conservative management with hormonal therapy may provide temporary relief from symptoms but is not a definitive treatment for adenomyosis.
**Option B:** Uterine artery embolization is a minimally invasive procedure that can reduce blood flow to the affected area, but it may not completely eliminate symptoms and is not a definitive treatment.
**Option C:** Myomectomy, which involves the surgical removal of uterine fibroids, may be beneficial for women with adenomyosis who wish to preserve fertility, but it is not the definitive treatment for adenomyosis.

**Clinical Pearl / High-Yield Fact**
Adenomyosis can be challenging to diagnose, and a definitive diagnosis is often made after histopathological examination of the uterus. A high index of suspicion is necessary, as symptoms can be similar to those of other gynecological conditions.

**Correct Answer: A. Hysterectomy**