Final answer:
The pancreas is a suitable control tissue for the Grimelius technique due to the presence of neuroendocrine cells within the islets of Langerhans. Hematopoiesis occurs in bone marrow, and granulocytes are a type of leukocyte.
Step-by-step explanation:
A good control tissue for the Grimelius technique would be D. Pancreas. The pancreas contains endocrine cells, especially in the pancreatic islets, or islets of Langerhans, which can be stained using this technique due to their neuroendocrine nature. Specifically, the alpha cells and beta cells within these islets produce hormones such as glucagon and insulin, which are the types of cells typically targeted and visualized using the Grimelius technique.
Hematopoiesis is the process of formation of blood cellular components, and it occurs in B. bone marrow. Specifically, hematopoiesis takes place in the red bone marrow. In fetal life, the liver is also a site of hematopoiesis, but in adults, bone marrow is the primary site.
Granulocytes are a type of D. leukocyte or white blood cells, which include neutrophils, eosinophils, and basophils, all of which contain granules in their cytoplasm and play various roles in the immune response.