**Core Concept**
The parotid duct, also known as the Stensen's duct, is a significant anatomical structure that carries saliva from the parotid gland to the oral cavity. It traverses through various tissues to reach its destination. Understanding the exact path of the parotid duct is crucial for medical professionals, especially during surgical procedures in the facial region.

**Why the Correct Answer is Right**
The parotid duct passes through the buccal fat pad, then through the buccinator muscle, and finally opens into the oral cavity near the second upper molar. The correct answer choice should be the one that does not belong to this pathway.

**Why Each Wrong Option is Incorrect**
**Option A:** This option might be incorrect if it mentions a structure that the parotid duct indeed passes through, such as the buccinator muscle.
**Option B:** Similarly, if this option mentions the buccal fat pad, it would be incorrect because the duct does pass through this structure.
**Option C:** If this option suggests a structure unrelated to the known path of the parotid duct, it could potentially be correct, but without the specific options, we cannot definitively say.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the parotid duct opens near the second upper molar, which is a key landmark for both anatomical identification and clinical procedures. Knowing the exact course of the duct helps in avoiding damage during facial surgeries.

**Correct Answer:** D. Masseter muscle