**Core Concept**
The adductor canal, also known as the subsartorial canal or Hunter's canal, is an intermuscular channel in the thigh, extending from the apex of the femoral triangle to the opening in the adductor magnus, the adductor hiatus. It contains vital structures that pass through it.

**Why the Correct Answer is Right**
To determine the correct answer, we need to identify the typical contents of the adductor canal, which include the femoral artery, femoral vein, and the saphenous nerve, along with the nerve to the vastus medialis.

**Why Each Wrong Option is Incorrect**
**Option A:** Typically, the femoral artery is a content of the adductor canal.
**Option B:** The femoral vein is also found within the adductor canal.
**Option C:** The saphenous nerve is another structure that passes through the adductor canal.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the adductor canal provides a protected passageway for these vital structures to traverse the thigh, and its contents can vary slightly but generally include the femoral artery and vein and the saphenous nerve.

**Correct Answer:** Correct Answer: D. Femoral nerve