<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:  Provide an example of a chemical reaction. Context: An example of a chemical reaction is the combination of hydrogen and oxygen to form water. Answer: [/INST]That reaction involves the combination of hydrogen and oxygen to form water.</s>