___________ are the organic compounds containing carbon, hydrogen, oxygen and nitrogen.

Explanation

**Step-by-Step Solution:**

1. **Identify the Elements**: The question asks for organic compounds that contain carbon, hydrogen, oxygen, and nitrogen. We need to recognize these elements first.
- Carbon (C)
- Hydrogen (H)
- Oxygen (O)
- Nitrogen (N)

2. **Determine the Type of Compounds**: Next, we need to identify which organic compounds are made up of these four elements.
- Organic compounds are those that primarily contain carbon and are often associated with living organisms.

3. **Recall the Specific Compounds**: Among the organic compounds, proteins are well-known to contain carbon, hydrogen, oxygen, and nitrogen.
- Proteins are essential macromolecules that play critical roles in the body.

4. **Conclude the Answer**: Therefore, the answer to the question is "Proteins".
- Proteins are organic compounds that consist of carbon, hydrogen, oxygen, and nitrogen.

**Final Answer**: Proteins are the organic compounds containing carbon, hydrogen, oxygen, and nitrogen.

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