Which of the following wars took place in the twentieth century: World War II, American Revolution, French Revolution, Hundred Years War, and the Vietnam War?
World War II and the Vietnam war took place in the twentieth century.
<s>[QUESTION] Which of the following wars took place in the twentieth century: World War II, American Revolution, French Revolution, Hundred Years War, and the Vietnam War? [CONTEXT]  [ANSWER] World War II and the Vietnam war took place in the twentieth century. </s>