Input question: What is the eighteenth letter of the Greek alphabet, equivalent to 'S'?

Output answer: sigma

Input question: A polliwog (or pollywog) is an old English word for which creature?

Output answer: tadpole

Input question: How is the Dardanelles campaign of World War I, which took place between April' 1915 and January 1916 better known?

Output answer: battle of gallipoli

Input question: Ehud Barak succeeded Binyamin Netanyahu as prime minister of which country in 1999?

Output answer:
israel