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

Now, solve this: Article: In the Arctic Ocean waters live the social animals---belugas, which is also known as white whales. Highly intelligent, these whales use different sounds to communicate and find their way. Belugas are also among the smallest kinds of whales. More than 210 belugas, including 31 in the United States, live in aquariums around the world. The Georgia Aquarium has asked for permission to bring 18 more belugas into the U.S. The whales were caught off the coast of Russia. The National Oceanic and Atmospheric Administration (NOAA) is considering the aquarium's request thoroughly. A law called the Marine Mammal Protection Act (MMPA) says the animals can only be brought into the country and put on display if they are caught without being hurt and there is an educational reason for doing so. Georgia Aquarium officials say the 18 belugas will help people learn more about the species and allow scientists to better understand how to protect it. The aquarium would also breed the whales so the U.S. aquariums can continue to display them. "When we can study and observe, we gain a better understanding of their biology and diseases that affect them, and learn how to aid populations in their natural habitats," says William Hurley, Georgia Aquarium's chief officer. "Much of this research would be impossible in the remote locations and extreme climates where the animals live." The Georgia Aquarium would own the 18 belugas and would rent some to aquariums across the country. Meanwhile, many scientists, including Lori Marino, a whale expert, feel strongly that the whales belong in the ocean, not in tanks. These scientists say the whales are being used for entertainment and not for education, and having them in aquariums is not necessary for the species to survive. Marino said, "Not only is it unfair to the belugas but there is no educational value in putting these whales on display."
Answer: They are the smallest in number.
Solution:
What can we learn about belugas?