<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 triggers the mass extinction of dinosaurs ? Context: The mass extinction of dinosaurs was triggered by a catastrophic asteroid impact. Answer: [/INST]The mass extinction of dinosaurs was triggered by a catastrophic asteroid impact.</s>