So who is wrong?

My wife was in college and this is a conversation she had with her philosophy professor:<br><br> Wife: A person can know something.<br> Prof: No they can't.<br> Wife: I know my name is \[Wife\] .<br> Prof: No you don't<br> Wife: Yes, I do know.<br> Prof: No you don't.<br> Wife: Yes, I do<br> Prof: Fine. If you know your name, tell me what it is<br> Wife: \[Wife\] .<br> Prof: See you don't really know your name. You just think you do.<br><br>&#x200B;