Q: What organ is also known as the "Graveyard of RBCs"?  

Answer: A

The spleen is a large bean-shaped organ located in the upper left side of the abdomen. It is also known as the "Graveyard of RBCs" due to its role in filtering out old and damaged red blood cells from the bloodstream. The spleen contains lymphocytes, phagocytes, and a large number of erythrocytes, which help to trap and destroy blood-borne microorganisms.

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