<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  Explain the function of red blood cells in the human body. Context: Red blood cells play a crucial role in transporting oxygen and removing carbon dioxide in the body. Answer: [/INST]They are responsible for transporting oxygen from the lungs to the body's tissues and removing carbon dioxide.</s>