How to show Answer's by different users to everyone?

The scenario is for a Quiz App where a question will be posted and everyone can answer. Now we can use user specific column to store user’s answer. How can we show answer of all user to everyone and top answer with indicator for logged-in user answer?

Also user can answer with/without login. How do we link the answer if user posted before login?

I can have Sign-In action to ask user to see other’s answers.