## Core Concept
The cell organelle that contains DNA is primarily the **nucleus** in eukaryotic cells. However, it's also important to note that **mitochondria** and **chloroplasts** contain their own DNA, often referred to as mtDNA and cpDNA, respectively. For the context of this question, focusing on the primary organelle associated with DNA in eukaryotic cells is key.

## Why the Correct Answer is Right
The **nucleus** is the organelle found in eukaryotic cells that serves as the repository for most of the cell's genetic material, or DNA. It is often referred to as the "control center" of a eukaryotic cell because it contains the genetic instructions used in the development and function of the cell. The nucleus is surrounded by a double membrane called the nuclear envelope, which has pores that allow for the transport of materials in and out of the nucleus.

## Why Each Wrong Option is Incorrect
- **Option A:** This option is not provided, but typically, incorrect organelles such as **lysosomes** (involved in digestion and recycling of cellular waste) or **ribosomes** (involved in protein synthesis) would not be correct because they do not primarily store DNA.
- **Option B:** Similarly, without the specific content of Option B, we can infer that any organelle not primarily known for storing genetic material would be incorrect. For instance, if Option B were **Golgi apparatus**, it would be incorrect because the Golgi apparatus is involved in protein modification, sorting, and packaging.
- **Option C:** If Option C were **mitochondria**, while it's true that mitochondria contain their own DNA (mtDNA), the question seems to focus on the primary organelle associated with DNA, which would be the nucleus in eukaryotic cells.
- **Option D:** Without the specific content, if we assume it's another organelle like **endoplasmic reticulum**, it would be incorrect because the endoplasmic reticulum is involved in protein synthesis, folding, and transport, not DNA storage.

## Clinical Pearl / High-Yield Fact
A high-yield fact to remember is that while the **nucleus** contains the majority of a cell's genetic material, **mitochondria** have their own DNA (mtDNA), which is inherited solely from one's mother. This fact can be crucial for understanding genetic diseases related to mitochondrial function.

## Correct Answer: C. Nucleus