<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 a binary tree? Context: A binary tree is a data structure composed of nodes with at most two children. Answer: [/INST]A data structure made up of nodes where each node has at most two children.</s>