50.根據Wilkes對顳顎關節內部紛亂（internal derangement）之分類，可分為幾期？ (A)3期： early , intermediate and late stages (B)4期： early , intermediate, late and terminal stages (C)5期： early , early/intermediate , intermediate , intermediate/late and late stages (D)6期： early , early/intermediate , intermediate , intermediate/late, late and terminal stages