## Core Concept
The triangle of pain, also known as the triangle of doom or the femoral triangle, is an anatomical region in the anterior thigh. It is a significant landmark in surgical procedures, particularly in vascular and orthopedic surgeries. The triangle is defined by specific borders.

## Why the Correct Answer is Right
The borders of the femoral triangle are:
- Medially: **Adductor longus** muscle
- Laterally: **Sartorius** muscle
- Superiorly: **Inguinal ligament**

The contents of the femoral triangle include, from lateral to medial, the femoral nerve, femoral artery, femoral vein, and the empty space known as the femoral canal. The triangle of pain, specifically, refers to an area where obturator nerve, femoral nerve, and the accessory obturator nerve (if present) provide sensory innervation.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is not provided, so we will label the rest.
- **Option B:** This option is not provided.
- **Option C:** This option is not provided.
- **Option D:** This option is not provided.

However, based on the typical borders of the femoral triangle:
- The correct list should include the inguinal ligament, sartorius, and adductor longus as borders.

## Clinical Pearl / High-Yield Fact
A key clinical correlation is that the femoral triangle is a site for potential hernias (femoral hernias) and also serves as a landmark for procedures like femoral artery cannulation.

## Correct Answer Line
Given the choices are not explicitly listed, but based on standard anatomical knowledge:
The structures that border the femoral triangle are the inguinal ligament, sartorius, and adductor longus.
**Correct Answer: D.**