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.

Example input: 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.
Example output: How many books are there in the British Library?
Example 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.
Q: Article: Once upon a time, a man was walking on a mountain when he found an incredible cave with all kinds of treasure inside it. So he gave up his job, his home, and his friends, and spent all his time guarding the cave. He was so dedicated to it that he hardly ate or drank, and before long he fell ill. One day, when he could hardly move at all, he decided to share the treasure. He crawled into the cave to get a handful of jewels, but discovered, to his horror, that it was empty except for a small emerald . The man took it, and gave it to the first person he came by, a woman. Then an old man came by. "What bad luck!" the man said. "Just a moment ago I gave a woman the last of the treasure I was guarding." "Are you sure there is nothing left?" the old man asked. The man took him into the cave, where they found a chest with jewels and some bags of gold. The man was shocked, and the old man explained to him, "At last! At last someone has broken the spell of this cave. This is the Cave of Treasure, and you're the first to have passed its great test. Many have dedicated their lives to this cave, only to end up realizing there was nothing here..." "And why does this happen?" the man asked. "This magic cave has only as many riches as your own heart. When someone discovers it, the cave is filled with treasure, but later, when they have devoted themselves to guarding the treasure, their hearts empty, as does the cave. The only way to fill it is by filling your heart with all that is good, as you did by giving the woman that last jewel." From that day on, the man understood that it was better to share than to keep. Thanks to the cave and the old man, he became noble and generous.
Answer: Because he had to guard the treasure cave.
A:
Why did the man give up his job, home and friends?