<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 is chemotherapy used for? Context: Chemotherapy is primarily used for cancer treatment, but it can also be used for certain autoimmune diseases. Answer: [/INST]Chemotherapy is used to treat cancer and some autoimmune diseases.</s>