FILL IN WHICH OR WHAT : 1/ WHAT dress shall I wear ,the red or the blue one ?

Question

FILL IN WHICH OR WHAT : 1/ WHAT dress shall I wear ,the red or the blue one ?

Answer 1

1/ What dress shall I wear ,the red or the blue one ? - Какое платье мне надеть, красное или синее? (which имеет значение КОТОРОЕ?)