**Core Concept**
In tuboplasty, the goal is to restore fertility by repairing or reconstructing the fallopian tubes. The success of tuboplasty depends on various factors, including the cause of tubal damage, the extent of damage, and the patient's age.

**Why the Correct Answer is Right**
Tuboplasty is most successful when performed for **cornual blockages**, which occur when the fallopian tubes are blocked at the cornual region, where the tubes meet the uterus. This type of blockage is often due to **adhesions** or **scar tissue** that can be easily removed during surgery. The success rate for tuboplasty in cases of cornual blockages is higher because the blockage is localized and can be effectively treated with minimal damage to the surrounding tissue.

**Why Each Wrong Option is Incorrect**
* **Option A:** Tuboplasty is less successful in cases of **distal tubal blockages**, which occur further down the fallopian tube. This type of blockage is often due to **salpingitis** or **pelvic inflammatory disease**, which can cause more extensive damage to the tube, making it harder to repair.
* **Option B:** **Proximal tubal blockages**, which occur closer to the uterus, can also be difficult to treat with tuboplasty. This type of blockage is often due to **endometriosis** or **adenomyosis**, which can cause scarring and adhesions that make it harder to repair the tube.
* **Option C:** Tuboplasty is not typically used to treat **tubal damage due to ectopic pregnancy**. In these cases, the damage is often too extensive, and the tube may need to be removed or reconstructed using a different surgical technique.

**Clinical Pearl / High-Yield Fact**
When considering tuboplasty, it's essential to evaluate the patient's age, the extent of tubal damage, and the underlying cause of the blockage. Patients under 35 years old with minimal tubal damage and a cornual blockage are more likely to achieve successful outcomes with tuboplasty.

**Correct Answer: A**