Final answer:
The best stain to use for evaluating a bone marrow sample for the presence of hemosiderin is Prussian blue.
Step-by-step explanation:
The best stain to use for evaluating a bone marrow sample for the presence of hemosiderin is Prussian blue. Prussian blue stain is specifically used to detect hemosiderin, which is an iron storage complex found in cells. It stains hemosiderin deep blue, allowing the technician to identify its presence in the bone marrow sample.