Missy Elliott / Mozart sample?

What is the Mozart song Missy Elliott sampled in her song "Who You Gonna Call"? The song is from the movie "Any Given Sunday," and I know it's Mozart's Requiem playing in the background...just not sure exactly which movement? I'm not huge into clical music, so I have no idea how to figure this out without listening to the whole thing, which is tough because I'm on dial-up.