**Core Concept**
The question is testing the indication for surgical repair of a double uterus, specifically focusing on the most important reason. A double uterus, such as a septate or bicornuate uterus, is a congenital anomaly of the uterus where the uterus is divided into two separate parts. The surgical repair, also known as a metroplasty, aims to correct this anomaly and improve reproductive outcomes.

**Why the Correct Answer is Right**
The most important indication for surgical repair of a double uterus is recurrent miscarriage. Women with a double uterus are at a higher risk of recurrent miscarriage due to the abnormal uterine anatomy, which can lead to inadequate implantation of the embryo and impaired placental development. In fact, studies have shown that up to 70% of women with a double uterus experience recurrent miscarriage. Surgical repair can help to improve the uterine cavity and reduce the risk of miscarriage. The procedure involves removing the septum or correcting the bicornuate shape of the uterus to create a more normal uterine cavity.

**Why Each Wrong Option is Incorrect**
**Option A:** Dysmenorrhea (painful menstruation) is not a primary indication for surgical repair of a double uterus. While some women with a double uterus may experience dysmenorrhea, this symptom is not a strong enough indication for surgery.

**Option B:** Infertility is a common issue for women with a double uterus, but it is not the most important indication for surgical repair. Infertility can be addressed through various treatments, including in vitro fertilization (IVF), and surgery may not always be necessary.

**Option C:** Abnormal uterine bleeding is not a primary indication for surgical repair of a double uterus. While some women with a double uterus may experience abnormal uterine bleeding, this symptom is not a strong enough indication for surgery.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that surgical repair of a double uterus can significantly improve reproductive outcomes, including reducing the risk of recurrent miscarriage and improving the chances of successful pregnancy.

**Correct Answer:** D. Recurrent miscarriage