CREATE TABLE table_20217 ("Date" CLOB, "Cover model" CLOB, "Centerfold model" CLOB, "Interview subject" CLOB, "20 Questions" CLOB, "Pictorials" CLOB)

Who was the interview subject when the centerfold model was Sherry Arnett?
SELECT COUNT("Interview subject") FROM table_20217 WHERE "Centerfold model" = 'Sherry Arnett'
SELECT COUNT("Interview subject") FROM "table_20217" WHERE "Centerfold model" = 'Sherry Arnett'