Consider the following terms related to cells.
1. Chromosome 2. Gene 3. Nucleolus 4. Ribosome
Out of the above parts of nucleus of a cell are

Options

A. 3 and 4
B. 2 and 3
C. 1 and 3
D. 1, 2 and 3

Explanation

To determine which of the given terms are parts of the nucleus of a cell, we can analyze each term one by one:

1. **Chromosome**:
- Chromosomes are structures within the nucleus that contain DNA. They carry genetic information and are crucial for cell division and inheritance. Therefore, chromosomes are indeed a part of the nucleus.

2. **Gene**:
- Genes are segments of DNA located on chromosomes. They are the basic units of heredity and are responsible for coding for proteins. Since genes are found on chromosomes, they are also considered part of the nucleus.

3. **Nucleolus**:
- The nucleolus is a dense region within the nucleus where ribosomal RNA (rRNA) is produced and assembled with proteins to form ribosomes. Thus, the nucleolus is a component of the nucleus.

4. **Ribosome**:
- Ribosomes are not located within the nucleus; instead, they are found in the cytoplasm or attached to the endoplasmic reticulum. They are responsible for protein synthesis but are not considered part of the nucleus.

Now, based on this analysis, we can conclude that the terms that are parts of the nucleus are:
- Chromosome
- Gene
- Nucleolus

**Final Answer**: The parts of the nucleus of a cell from the given options are Chromosome, Gene, and Nucleolus.