Which of the following country was not the part of Central Powers in the First World War?

The assassination of an Austrian prince by Serbia's Slav population in 1914 marked the beginning of the First World War, which lasted until 1918. The Central Powers and the Allied Powers engaged in combat. Russia, France, and Great Britain were the main allies in the First World War. In 1917, America took action on the side of the Allies. The Central Powers were represented by Germany, Austria-Hungary, and Turkey.