sentence2_structure: The main function of the spleen<>is<>to filter the blood and remove unwanted red blood cells
sentence1: The spleen acts as a filter against foreign organisms that infect the bloodstream, and also filters out old red blood cells from the bloodstream and decomposes them.
sentence2: The main function of the spleen is to filter the blood and remove unwanted red blood cells.
question: The main function of this organ is to filter the blood and remove unwanted red blood cells?