In this task, you're given an article and an answer. Your task is to generate the question for the answer based on the given article.
One example is below.
Q: Article: There are a lot of public libraries in Britain. These libraries have more than one hundred and fifteen million books, not including those libraries of public schools. Public libraries not only lend books, music records but also help children, patients in hospitals and others to get special play readings, film shows and so on. The first public libraries were founded in about the year 1850. Today's public libraries usually have a reading-room, a lending room and a reference room. The greatest and most famous library in Britain is that of the British Library in London. It was founded in 1973 and has over 10, 000, 000 books. It has nearly every magazine, newspaper and book published in Britain and other parts across the world.
Answer: 10,000,000 or less.
A: How many books are there in the British Library?
Rationale: In the Article, 10,000,000 is mentioned for the number of books available in the British Library, so this is a good question.
Q: Article: Baroness Thatcher, Britain's greatest post-war prime minister, died at the age of 87 after suffering a stroke (a disease related to blood vessels in the brain), her family announced on 8 April 2013. Her son, Sir Mark, and daughter Carol confirmed her death that morning. zxxk Margaret Thatcher, daughter of a businessman and mayor of Grantham, was educated at the local grammar school, and at Oxford, where she got a degree in chemistry, and upon graduation she worked for four years as a research chemist. She then qualified as a lawyer in 1954. As Miss Margaret Roberts, she stood twice in parliamentary elections for the Conservative Party , before being elected (after her marriage) to the House of Commons in 1959. When the Conservatives returned to office in June 1970, she was appointed secretary of state for education and science. After the Conservatives lost power in 1974, she was appointed to the Shadow Cabinet , and was elected leader of the Conservative Party in 1975. Baroness Thatcher became prime minister on 4 May 1979 and went on to earn the nickname "the Iron Lady", becoming known for her strong responses to the political and economic crisis, which Thatcher's supporters think are good for Britain, while her opposers argue that her policies destroyed British manufacturing. Lady Thatcher governed Britain from 1979 to 1990. She will go down in history not only as Britain's first female prime minister, but as the woman who changed Britain's economy in addition to being an awesome rival on the international stage. zxxk Lady Thatcher was the only British prime minister to leave behind a set of ideas about the role of the state which other leaders and nations try to copy and apply.
Answer: 53
A:
How old was Lady Thatcher when she became prime minister?