Head of mammalian sperm possesses :

Options

A. mitochondria and centriole
B. mitochondria only
C. centriole only
D. nucleus only

Answer

To answer the question "Head of mammalian sperm possesses:", we need to analyze the structure of the sperm and identify what is present in the head region.

### Step-by-Step Solution:

1. **Identify the Structure of Sperm**:
- The sperm consists of four main parts: the head, neck, middle piece, and tail.

2. **Focus on the Head Region**:
- The head of the sperm contains an elongated haploid nucleus, which is crucial for genetic material transfer during fertilization.

3. **Acrosome**:
- The anterior portion of the head is covered by a cap-like structure known as the acrosome. The acrosome contains enzymes that are essential for the fertilization process.

4. **Examine Other Parts**:
- The middle piece of the sperm contains mitochondria, which provide energy for the movement of the tail. However, this is not part of the head.

5. **Conclusion**:
- Therefore, the head of the mammalian sperm primarily possesses the nucleus and the acrosome. It does not contain mitochondria or centrioles.

6. **Correct Answer**:
- The head of the mammalian sperm possesses the nucleus only.