The correct option is C Conglobate gland
The prostate gland is a walnut-sized gland located between the bladder and the penis in mammals
Pineal gland is a small endocrine gland present in the brain in mammals.
Cowper's gland is a pair of exocrine glands in the male reproductive system.
On the other hand, the conglobate gland is the gland present in the male cockroaches and is a reproductive organ.
Thus, the correct answer is option C.