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 technique involves the transfer of foreign DNA into a host with the involvement of vectors, we can analyze the options provided:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks for a method that uses a vector to transfer foreign DNA into a host cell. A vector is a vehicle used to transfer genetic material into a cell.

2. **Evaluate Option A - Liposome**:
- Liposomes are spherical vesicles that can encapsulate DNA and facilitate its entry into cells.
- **Key Point**: This method does not require a vector. Therefore, Option A is incorrect.

3. **Evaluate Option B - Calcium Ion Method**:
- This method involves using calcium ions (e.g., calcium chloride) to increase the permeability of the cell membrane, allowing DNA to enter.
- **Key Point**: No vector is involved in this process either. Hence, Option B is incorrect.

4. **Evaluate Option C - Adenovirus**:
- Adenoviruses can be engineered to carry foreign DNA. The desired DNA is inserted into the adenovirus, which then infects the host cell.
- **Key Point**: Here, adenovirus acts as a vector to transfer the foreign DNA into the host. Therefore, Option C is correct.

5. **Evaluate Option D - Electroporation**:
- Electroporation involves applying an electrical field to cells, creating temporary pores in the cell membrane through which DNA can enter.
- **Key Point**: This method does not use a vector. Thus, Option D is incorrect.

6. **Conclusion**: The only method that involves a vector for the transfer of foreign DNA into a host is the use of adenovirus. Therefore, the correct answer is **Option C - Adenovirus**.

### Final Answer:
**Option C - Adenovirus**