How to find out which key (~/.ssh/authorized_keys) was used for authorization?

Question

linux

Let's say the user user has 5 different keys in the authorized_keys file.
Is it possible to find out by which key the current user was authorized?

Answer 1

unix.stackexchange.com/questions/15575/can-i-find-out-which-ssh-key-was-used-to-access-an-account
First answer - isn't it?