Setting up Q&A websites in wordpress

Is there some theme for this? And are their such popular platforms running on wordpress? Do not want to get the trouble of something like quora as developing it will be full of lot of bugs.

You could check some of these themes out, but I suspect any Q&A themes are going to run into bugs. Any time you are letting the public add content to your site, bugs will be a thing that need to be addressed. Play around the demos, check the support terms before purchasing anything, check the reviews for bug reports.

https://betterstudio.com/wordpress-themes/best-wordpress-themes-like-quora/