A%2C B OR C%2C BUT NOT X%2C Y OR Z' The crossword solution for the term 'A, B OR C, BUT NOT X, Y OR Z' is VITAMIN. Vitamins are essential nutrients that the body needs in order to function properly. They are divided into two categories: fat-soluble vitamins (A, D, E, and K) and water-soluble vitamins (B and C). The fat-soluble vitamins are stored in the body's fatty tissue, while the water-soluble vitamins are not. Therefore, the answer to this crossword clue is A, B or C, BUT not X, Y or Z, which refers to the two categories of vitamins.