As soon as she heard her classmates giggle and utter the word “Negro,” 17-year-old Kayla Thomas started thumbing ahead in the test that had been handed out to her psychology class. She was stunned to find her Advanced Placement class had been given a copy of the so-called “Chitling Intelligence Test,” a multiple-choice exam, which includes references to “handkerchief heads,” welfare mothers and how long chitlings should be cooked.