This is part of UX mistakes, a weekly newsletter.
For single-answer-questions in a form, you can either place a drop-down or go with radio-buttons. A list of radio buttons shows all possible answers but can take a lot of space if the list is long.
Use Radio-buttons for a few options like the selection of gender. Use Drop-downs for many options like a selection of a country.
Check your forms. Make sure to use radio-buttons for up to 4 options. With 5 or more options, it is often better to go with a drop-down.
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