<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 with nodes having at most two children, a left child and a right child. Answer: [/INST]A binary tree is a data structure where each node has at most two children, referred to as the left child and the right child.</s>