The potential to limit WhatsApp polls to only one correct answer is currently under development. The feature is available for Android beta users with app version 184.108.40.206. After the organisation ensures that the new toggle is stable and ready for prime time, a public rollout should occur in the coming weeks.
When creating polls, the toggle appears below the answer options. When this option is enabled, respondents will only be able to select one correct option. If you would like to keep multiple options available, simply turn off the toggle before publishing the poll. It’s absolutely simple but effective feature that improves WhatsApp polls significantly.