Complete the pair :
ACEG : IKMO : : QSUW : ?

​ACEG : IKMO : : QSUW : ?

Logic: Each letter is shifted +8 positions in alphabetically.

A → I (+8)

C → K (+8)

E → M (+8)

G → O (+8)

Apply same to QSUW:

Q → Y (+8)

S → A (+8, after Z cycle)

U → C (+8)

W → E (+8)

Result = YACE