Want Chrome browser to ask for certificate each time

I have a site I visited where I need to use different certificates for different tasks. I visited the site once and selected a certificate. Now Chrome just assumes that certificate.

I want Chrome to ask me which certificate to use every time I visit.

You may remove a certificate in Chrome via Settings > Advanced > Manage certificates.

A dialog will be displayed with all the stored certificates, where you can delete the certificate for that by selecting it and clicking the Remove button. You may also use the buttons of "Export..." and "Import..." to save and restore certificates.

If you don't want future certificates to be remembered, access this website using an Incognito browsing window.

Another mechanism you may use is having multiple profiles, as the certificates are local to the profile.