Options are offered 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.

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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.