The correct statement regarding adipose tissue is: b its primary function is nutrient storage.
Adipose tissue is primarily known for its role in storing energy in the form of fat. It consists of adipocytes, which are specialized cells that store these fats. The other options are incorrect; adipose tissue does not consist mainly of extracellular matrix (option a), mature adipose cells are generally not highly mitotic (option c), and the primary component in adipocytes is fat, not the nucleus (option d). Therefore, the main role of adipose tissue is indeed to store nutrients, making option b the correct choice.