Here are some common examples of prefixes you might see:
* Mr.
* Ms.
* Mrs.
* Dr.
* Professor
* Reverend
It's important to note that some applications might not have a separate field for prefixes. In these cases, the applicant may be asked to include their full name, which would inherently contain the title if applicable.
If you're unsure what prefix to use, it's always best to err on the side of formality and use the most respectful option.