What is the english word for one answers?

There isn't a single English word that perfectly encapsulates the meaning of "one answers."

However, depending on the context, you could use several phrases to convey the same idea:

General:

* Single answer

* One response

* A solitary reply

Specific:

* The only answer (if there is only one correct or possible answer)

* The right answer (if one answer is correct)

* The correct answer (if one answer is correct)

* The best answer (if one answer is considered the most suitable)

The best choice will depend on the specific situation and what you want to emphasize.