**Core Concept**
Wilms tumor, also known as nephroblastoma, is a type of kidney cancer that primarily affects children. It is a malignant tumor that originates from the embryonic cells of the kidney. The genetic predisposition to Wilms tumor is influenced by mutations in specific genes.

**Why the Correct Answer is Right**
The gene responsible for Wilms tumor is WT1 (Wilms Tumor 1), which is a tumor suppressor gene. WT1 is located on the short arm of chromosome 11 (11p13). Mutations in the WT1 gene can lead to the development of Wilms tumor, as it plays a crucial role in regulating cell growth and division in the developing kidney. The WT1 gene encodes a transcription factor that regulates the expression of other genes involved in kidney development.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the gene for retinoblastoma, RB1, is located on chromosome 13 (13q14), not associated with Wilms tumor.
**Option B:** This option is incorrect because the gene for neurofibromatosis type 1, NF1, is located on chromosome 17 (17q11.2), which is not directly related to Wilms tumor.
**Option C:** This option is incorrect because the gene for Li-Fraumeni syndrome, TP53, is located on chromosome 17 (17p13.1), which is a tumor suppressor gene but not specifically associated with Wilms tumor.

**Clinical Pearl / High-Yield Fact**
Wilms tumor is often associated with other congenital anomalies, such as genitourinary abnormalities and hemihypertrophy, due to the genetic predisposition. The WT1 gene is also involved in the development of other cancers, including leukemia and ovarian cancer.

**Correct Answer:** C. 11p13.