<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:  What causes tides on Earth? Context: Tides on Earth are caused by the gravitational pull of the moon and the sun. Answer: [/INST]The gravitational pull of the moon and the sun.</s>