Nutritional studies is carried out by use of

Answer: Option C

Nutritional studies are carried out by use of Cockroaches.
Cockroaches are an important source of food for several organisms, including arthropods, birds, and mammals. As such, they are an important part of the food chain. Cockroaches also play an extremely important role in nutrient cycling.
Cockroach contains protein crystals that contain a considerable amount of energy, much higher than that found in dairy milk from cows. The proteins are also packed with a large number of essential amino acids, which are good for muscle repair.