**Core Concept**
The aortic opening of the diaphragm is a crucial anatomical structure that allows for the passage of the aorta, thoracic duct, and other vital structures between the thoracic and abdominal cavities. Understanding the diaphragm's anatomy is essential for various medical and surgical procedures.

**Why the Correct Answer is Right**
The aortic opening of the diaphragm is a large, oval-shaped opening that allows for the passage of the descending aorta, thoracic duct, and esophageal branches of the vagus nerve. The aortic opening is located at the level of T12, and its edges are formed by the crura of the diaphragm. The correct answer is the structure that does not pass through this opening.

**Why Each Wrong Option is Incorrect**
* **Option A:** The thoracic duct passes through the aortic opening of the diaphragm, making it an incorrect answer.
* **Option B:** The esophagus passes through the esophageal hiatus of the diaphragm, which is a separate opening, making it an incorrect answer.
* **Option C:** The aorta passes through the aortic opening of the diaphragm, making it an incorrect answer.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the aortic opening of the diaphragm is a large opening that allows for the passage of vital structures, and its edges are formed by the crura of the diaphragm. This knowledge is crucial for various medical and surgical procedures.

**Correct Answer: B. Esophagus**