<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:  Which event marked the start of World War II? Context: The invasion of Poland by Germany marked the start of World War II. Answer: [/INST]The invasion of Poland by Germany.</s>