Question: Which American author has sold over 600 million copies one of which had a television special of it in 1971?
Sentence (from "The Cat in the Hat (TV special)"): The Cat in the Hat is an American animated musical television special first aired on CBS on March 10, 1971, based on the 1957 Dr. Seuss children's book of the same name, and produced by DePatie-Freleng Enterprises.
Relevant evidence: Yes