The correct option is
A Stink glands
(A) Stink glands are present in millipede and cockroach and they serve as a defense gland. It is also called the ozopore which discharge smelly liquid which helps to get protected from the predator.
(B) Scent glands are present in deer and rabbit and act as the messenger for mood and sexual power.
(C) Silk glands are present in silk-producing insects.
(D) Poison glands are another defense gland which is present in snakes and some species of fish.
The correct option is 'Stink glands'.