One amongst the following is involved in transfer of foreign DNA into host with the involvement of vectors :

Options

A. Liposome
B. Use of divalent `Ca^(2)`
C. Adenovirus
D. Electroporation

Answer

To solve the question regarding which option is involved in the transfer of foreign DNA into a host with the involvement of vectors, we can analyze each option provided.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a method that involves the transfer of foreign DNA into a host cell using a vector. A vector is a vehicle, often a virus or plasmid, that can carry foreign DNA into a host cell.

2. **Analyzing Option A - Liposome**:
- Liposomes are spherical vesicles that can encapsulate DNA and facilitate its entry into cells. However, they do not involve a vector in the traditional sense since they do not use a biological vector to transfer DNA.
- **Conclusion**: Incorrect option.

3. **Analyzing Option B - Divalent Calcium**:
- The use of divalent calcium (like calcium chloride) enhances the ability of cells to take up DNA through a process called transformation. However, this method does not involve a vector; it simply increases the efficiency of DNA uptake.
- **Conclusion**: Incorrect option.

4. **Analyzing Option C - Adenovirus**:
- Adenoviruses are a type of virus that can be used as vectors to deliver foreign DNA into host cells. The foreign DNA is inserted into the adenovirus, which then infects the host cell, allowing the DNA to be expressed within the host.
- **Conclusion**: Correct option.

5. **Analyzing Option D - Electroporation**:
- Electroporation involves applying an electrical field to cells to increase their permeability, allowing DNA to enter. This method does not utilize a vector; it relies on physical means to facilitate DNA uptake.
- **Conclusion**: Incorrect option.

### Final Answer:
The correct answer is **Option C - Adenovirus**, as it is involved in the transfer of foreign DNA into the host with the involvement of vectors.

---