I was once in this position, but decided to continue through with the "right" answer anyway. Even though the interviewer was adamant that he was right (as, of course, was I), we briefly stopped the interview and made some Google searches to get to the truth.

I could ostensibly argue that I got the job not by telling the interviewer what he wanted to hear, but by doubling down on the right answer and showing that I had the capacity to prove it.