Which organ near the stomach is responsible for producing, storing, and eliminating blood cells?

The spleen is primarily responsible for producing, storing, and eliminating blood cells, making it the correct answer. It plays a crucial role in the immune system by filtering the blood and recycling iron from old red blood cells. Located near the stomach, the spleen is involved in the production of lymphocytes, which are vital for immune response, as well as the management of the body's blood supply.

While the liver processes nutrients and detoxifies blood, it does not specifically produce or eliminate blood cells like the spleen does. The pancreas is primarily involved in digestion and the regulation of blood sugar levels through hormone production, specifically insulin and glucagon. The kidneys are critical for filtering waste from the blood, regulating electrolytes, and maintaining fluid balance, but they do not have a direct role in blood cell production or elimination.