The correct answer is option 'A' - Collateral glands.

Mouthparts of cockroaches are specialized structures that are adapted for various functions such as feeding, grooming, and sensing the environment. The mouthparts of cockroaches are made up of several components, including the maxilla, mandible, and hypopharynx.

- Maxilla: The maxilla is a paired structure located on either side of the mouth. It is composed of several segments, including the cardo, stipes, and galea. The maxilla functions in manipulating and crushing food particles.

- Mandible: The mandible is another paired structure located below the maxilla. It is the primary biting and chewing organ of the cockroach. The mandible is responsible for cutting and grinding food into smaller pieces.

- Hypopharynx: The hypopharynx is a tongue-like structure located in the floor of the mouth. It lies between the maxilla and labium. The hypopharynx assists in the movement of food towards the esophagus.

- Collateral Glands: The collateral glands are not a part of the mouthparts of cockroaches. Instead, they are located in the reproductive system of cockroaches. These glands are involved in the production of seminal fluid, which is transferred to the female during mating.

The mouthparts of cockroaches are well-adapted for their omnivorous diet. They are capable of feeding on a wide variety of food sources, including decaying organic matter, plant material, and even other insects. The maxilla and mandible work together to process and manipulate food, while the hypopharynx helps in the movement of food towards the digestive system.

In conclusion, the collateral glands are not included in the mouthparts of cockroaches. They are reproductive glands located in the reproductive system. The correct answer is option 'A'.