Which one is produced during cyclic photo phosphorylation ?

Options

A. ATP and `NADPH_(2)`
B. ATP only
C. ATP and `O_(2)`
D. `NADPH_(2)`

Answer

### Step-by-Step Solution:

1. **Understand the Process**: Photophosphorylation is the process of synthesizing ATP using light energy. There are two types of photophosphorylation: cyclic and non-cyclic.

2. **Identify the Types**:
- **Cyclic Photophosphorylation**: In this process, electrons are cycled back to the photosystem, resulting in the production of ATP only.
- **Non-Cyclic Photophosphorylation**: This process involves the flow of electrons from water to NADP+, resulting in the production of both ATP and NADPH, along with oxygen as a byproduct.

3. **Focus on Cyclic Photophosphorylation**: Since the question specifically asks about cyclic photophosphorylation, we need to determine what is produced in this process.

4. **Conclusion**: During cyclic photophosphorylation, only ATP is produced. Therefore, the correct answer to the question is "ATP only".

### Final Answer:
**ATP only**