**Core Concept**
Gastrulation is a critical phase in embryonic development where the blastula undergoes reorganization to form the three primary germ layers: ectoderm, endoderm, and mesoderm. A defect during gastrulation can lead to various congenital anomalies and tumours.

**Why the Correct Answer is Right**
The correct answer is associated with a tumour that arises from the primitive streak, a transient structure formed during gastrulation. The primitive streak is involved in the formation of the mesoderm and endoderm from the epiblast. A defect in this process can lead to the formation of a tumour that is characterized by an abnormal proliferation of cells.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is associated with a tumour that arises from the neural crest, which is a group of cells that migrates from the dorsal neural tube during embryonic development, but it is not directly related to gastrulation.

**Option B:** This option is incorrect because it is associated with a tumour that arises from the epithelial lining of the gut, which is formed later in embryonic development, after gastrulation.

**Option C:** This option is incorrect because it is associated with a tumour that arises from the neural tube, which is formed during neurulation, a later stage of embryonic development.

**Clinical Pearl / High-Yield Fact**
A key takeaway from this question is that tumours arising from defects during gastrulation are often characterized by an abnormal proliferation of cells and can be associated with various congenital anomalies.

**Correct Answer:** C.