I got a question for you: Passage: The spleen is an organ found in virtually all vertebrates. Similar in structure to a large lymph node, it acts primarily as a blood filter. The word spleen comes from Ancient Greek σπλήν (splḗn).\n\nQuestion: Based on this passage, what is the purpose of the spleen in a human body?
Let's think first:
User
To answer the above question, the relevant sentence is: Similar in structure to a large lymph node, it acts primarily as a blood filter.
Therefore, the answer is a blood filter.
Assistant