**Core Concept**
Chromosomes are complex structures composed of DNA, proteins, and other molecules that carry genetic information essential for cell function and reproduction. The components of a chromosome include DNA, histone proteins, and non-histone proteins.

**Why the Correct Answer is Right**
The correct answer is a combination of DNA and proteins. DNA is the primary genetic material found in chromosomes, responsible for storing and transmitting genetic information. Histone proteins, such as H2A, H2B, H3, and H4, form a core structure around which DNA is wrapped, while non-histone proteins, like topoisomerase and condensin, play crucial roles in DNA replication, repair, and chromosome condensation. The specific combination of DNA and proteins is essential for chromosome structure and function.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is likely incomplete or incorrect, as chromosomes are composed of more than just DNA.
* **Option B:** This option might be a single component of a chromosome, but it is not the complete answer.
* **Option D:** This option could be a type of protein or molecule associated with chromosomes, but it is not the comprehensive answer.

**Clinical Pearl / High-Yield Fact**
Understanding the components of chromosomes is crucial in genetics and molecular biology. The correct answer emphasizes the importance of DNA and proteins in chromosome structure and function, which is essential for cell reproduction and genetic inheritance.

**Correct Answer:** C. DNA and proteins.