A Website where the user alterts us about a defect on his printer.
There are predefined categories (things like error messages in the printer display, issues with the prints, issues with paper jams, issues with noise and so on) maybe around 10 to 20 categories.
They decide which fields are shown when the user selects it.

Should I do a Dropdown? List field? Radio buttons?

Tech: PHP, Slim Framework, fontsawesome, resulting in a mail sent to our ticket system to pre-fill form items to avoid 1st level support...