**Core Concept**
The oesophagus receives its blood supply from various branches of the aorta and its branches. The oesophageal branches arise from these arteries to supply the oesophagus, ensuring its proper functioning and maintenance of its integrity. The oesophageal branches are crucial for the oesophagus' survival, especially during oesophageal surgeries or procedures.

**Why the Correct Answer is Right**
The oesophagus is primarily supplied by branches from the aorta and its branches, including the inferior thyroid artery, descending thoracic aorta, and left gastric artery. These arteries supply the upper, middle, and lower parts of the oesophagus, respectively. The right gastric artery, however, primarily supplies the stomach and does not have any direct branches that supply the oesophagus. This is due to the oesophagus receiving its blood supply from the aorta and its branches, which are located more proximally and caudally.

**Why Each Wrong Option is Incorrect**
**Option A:** The inferior thyroid artery does supply the oesophagus, particularly the upper part, via its esophageal branches. This artery is a common source of oesophageal supply.
**Option B:** The descending thoracic aorta gives off oesophageal branches that supply the middle part of the oesophagus. This artery is a vital source of blood supply for the oesophagus.
**Option C:** The left gastric artery supplies the oesophagus, particularly the lower part, via its left gastric oesophageal branches. This artery plays a significant role in the oesophageal blood supply.

**Clinical Pearl / High-Yield Fact**
The oesophageal blood supply is crucial to remember during oesophageal surgeries, as compromising this blood supply can lead to severe complications, including oesophageal necrosis and perforation.

**✓ Correct Answer: D. Right gastric artery**