Lie or Hide the sins?

I know this is a different question but I hope someone has an answer for it. In Islam, it’s a sin to lie. At the same time, it’s a sin to expose your sins. If a person asks another person to tell them if they have done a certain sin or not, and in reality they have done it, then what should they do? They can either say the truth which would mean exposing their sins. Or they can say that they haven’t done the sin which would mean that they are lying.