I have to confess that my resumes usually contain two things that aren't strictly true, but are simplifications of what the full truth is. I state that my Bachelor's is Computer Science, rather than the strictly truthful Mathematical Sciences with a Concentration in Computer Science; until a few years ago, that university's CS department didn't offer an undergrad degree per se, but ran it through the Math Sci catchall (as I recall, there were five different concentrations, none of the other four having anything to do with CS). But for all effects and purposes, it was a CS major.

I also slightly fudge things by listing the years I was in residence at said undergrad school and that I have a Bachelor's from it. Since my official graduation year is two years after that, and is after one year of grad school elsewhere (Yale in fact) and a year working at another university, and involves about 10 minutes of explanation as to how that's the case, leaving off the official year and letting people assume it matches up with my last year in residence again simplifies things.

I'm more than happy to tell people the full truth and explain it, but don't see the point in doing so until later in the process; the full truth just complicates things with unnecessary at the point where someone's reviewing the resume info.