题目:Which of the following statements is not true?
A. Pop music is not recognized as a separate genre until the 1950s.
B. Pop music is usually very commercial due to its wide popularity.
C. Pop songs, such as Thriller, Country Road Take Me Home, were sold millions of copies.
D. Michael Jackson, Backstreet Boys, and Carly Rae Jepson are all super Pop stars.
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