<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:  Who was the founder of the philosophy of Existentialism? Context: Jean-Paul Sartre is known as the founder of the philosophy of Existentialism. Answer: [/INST]The founder of the philosophy of Existentialism was Jean-Paul Sartre.</s>