**Core Concept**
The question is testing the student's knowledge of the fundamental disciplines of genetics. The study of the structure and products of genes is a critical aspect of molecular biology, which underlies many modern medical and scientific advancements.

**Why the Correct Answer is Right**
The correct answer is related to the study of the structure and products of genes, which involves understanding the genetic code, gene expression, and the proteins synthesized from genes. This field of study is essential for understanding various diseases, developing new treatments, and improving human health. The correct answer is **Cytogenetics**, which is the branch of genetics that deals with the structure and products of genes, including the study of chromosomes, genes, and gene expression.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not directly related to the study of gene structure and products. It might be a distractor, but it doesn't fit the context of the question.
* **Option B:** This option is not relevant to the study of gene structure and products. It might be a distractor, but it doesn't fit the context of the question.
* **Option D:** This option is not directly related to the study of gene structure and products. It might be a distractor, but it doesn't fit the context of the question.

**Clinical Pearl / High-Yield Fact**
Cytogenetics is crucial in diagnosing genetic disorders, such as chromosomal abnormalities, and in understanding the genetic basis of diseases like cancer. It also plays a vital role in prenatal diagnosis and genetic counseling.

**Correct Answer:** C. Cytogenetics.