You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Cyprus

Context:
The island would serve Britain as a key military base for its colonial routes. By 1906, when the Famagusta harbour was completed, Cyprus was a strategic naval outpost overlooking the Suez Canal, the crucial main route to India which was then Britain's most important overseas possession. Following the outbreak of the First World War and the decision of the Ottoman Empire to join the war on the side of the Central Powers, on 5 November 1914 the British Empire formally annexed Cyprus and declared the Ottoman Khedivate of Egypt and Sudan a Sultanate and British protectorate.

Question:
Which side did the Ottoman Empire join in World War 1?

Central Powers