Final answer:
The oldest genus of ornithischian dinosaur is not from South America.
Step-by-step explanation:
The statement is false. The oldest genus of ornithischian dinosaur, which is the "bird-hipped" lineage, is not from South America. Birds evolved from the saurischian "lizard-hipped" lineage. The oldest known fossil of a "dinosaur-bird" is Archaeopteryx, which is from the Jurassic period and is considered to be an intermediate species between dinosaurs and birds.