The peculiar pungent smell of cockroach is produced by the secretions of
(A) Pheromones
(B) Flame cells
(C) Abdominal glands
(D) Cervical glands

Hint: Pheromones are types of chemical secretions that are secreted in small amounts and cause distinct physiological or behavioral responses towards other members of the similar species. These secretions are also used for inducing mating with the opposite sex of the same species.

Complete step by step answer:
The peculiar pungent smell of cockroach is produced by the secretions of pheromones.
Various types of pheromones are found, including sex pheromones, alarm pheromones, food trail pheromones, sex pheromones, and others. These different types of pheromones significantly affect the behavioral changes or physiology.The flame cells are a group of cells that are presented in nephridia of cockroaches. These are majorly used by these species for excretion and osmoregulation.The flame cells are a specified excretory cells which are abundantly found in the invertebrates living in freshwater such as flatworms, rotifers, etc. Flame cells function like a kidney, removing waste materials. The glands which are presented in the abdominal regions are termed as abdominal glands. Some of the major types of abdominal glands present in cockroaches are testes and vasa deferentia. Apart from this the glands which are presented in the cervical sections are also recognized as abdominal glands. The reproductive system of the cockroaches are found in the abdominal segments.

Thus, the correct answer is option (A).

Note:
Various insects like bees, ants, wasps, and others largely depend upon the pheromones as a potential mode of communication. Pheromones play a crucial role in mating and are commonly released by the females of the species to entice the males of the same species.