Hi 
@Tuan_Anh_Le,
In my understanding, you are attempting the Python language practice question for the MongoDB DEV certification exam.
If yes then please refer to the official documentation of the python driver to learn more. I would encourage you to re-attempt the practice question using the correct option and share your feedback with us.
If you have any further questions or concerns, please don’t hesitate to reach out to us.
Thanks,
Kushagra