You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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.

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.
Solution: How many books are there in the British Library?
Why? In the Article, 10,000,000 is mentioned for the number of books available in the British Library, so this is a good question.

New input: Article: Thousands of years ago, people only ate food that was grown near their homes. Some kinds of food were only grown in one place, so people from other places didn't know about them. When Europeans first traveled to Central and South America in the 1500s, they discovered strange kinds of food that they had never seen before. Today, these are grown in a lot of different countries and they're sold in supermarkets all over the world. They don't seem strange any more! Potatoes were first grown in the Andes in South America. In 1586, they were taken to Europe by explorers . In 1719, they were taken to North America. Before 1719, nobody in North America had ever seen or eaten a potato. Today each American eats more than 60 kilos of potatoes a year. Tomatoes were also first grown by native Americans. When European explorers visited the south of America in 1500, they took tomato seeds back to Europe. Soon, tomatoes were grown in Europe, but people in England didn't eat them. At that time, a lot of English people thought that tomatoes were _ ! Chilies have been eaten in Central and South America for more than 8,000 years! In the 1500s, chilies were taken to Europe by explorers. Today, they are grown in hot countries all over the world.
Answer: Three.
Solution:
How many kinds of food are mentioned in the passage?