TASK DEFINITION: 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.
PROBLEM: Article: Mark Twain was a famous American writer in his day. He liked to play jokes on his friends. One day one of his friends lost his wallet and asked Mark Twain to pay his train ticket for him. "But I don't have enough money to pay both your ticket and mine," Mark Twain said. The friend didn't know what to do. "We can do this," said Mark Twain." We can get on the train and when the conductor came to check the tickets , you can hide under my seat." Later, however, when the conductor came to check the tickets, Mark Twain gave him two tickets --- one for himself and one for his friend . Then he explained in aloud voice," My friend is a strange man. When he travels on a train, he does not like to sit on the seat." Of course everyone in the train looked at the poor friend under the seat and laughed at him loudly.
Answer: Because the friend lost his money.

SOLUTION: Why did the friend ask Mark Twain to pay his train ticket for him?

PROBLEM: Article: Buster Brown was a thief and a good one too,he thought. He'd never been caught by the police because he never took chances.He was always prepared for any unforeseen event or emergency. Confidently,he stood outside the house of his intended victim and read the sign on the front gate of the house."Don't worry about the dog--be aware of the owner!" it said.Buster smiled and found his way in. The house looked quite normal outside,but inside it was very exotic with fascinating objects on display.As he began putting them into his bag,a dog came into the room.It stopped when it saw Buster,then wagged its tail madly and went over to him,licking his outstretched hand. "Good boy," Buster whispered. "What a great guard dog you are--trying to lick me to death." Satisfied he'd made friends with the dog,Bluster began to wander round the house,choosing items to put in his bag.His skilled eye picked out only the best antiques :a pair of silver candleholders,a silver tea-and-coffee service,etc..His new friend,the dog,sat and watched,as if wondering what was happening. "Well,boy," Buster whispered,finally."That might do.Any more and I won't be able to carry it!" He swung the heavy bag onto his shoulders, just as the lights came on, nearly blinding him. He shielded his eyes with his hand. "You're a very silly person," the figure in the doorway said, his voice dry and dust. As the man came closer, Buster could see he was well dressed. His face seemed familiar, but Buster couldn't quite place where he had seen him before. "You should have taken more notice of the sign outside," the man rasped. "I knew about this attempted robbery last week and I also know you will end up behind bars for 20 years. Fancy trying to rob the house of the world's greatest fortune-teller!"
Answer: He had never been caught by the police.

SOLUTION: Why was Buster so confident?

PROBLEM: Article: It's 2035. You have a job, a family and you're about 40 old. Welcome to your future life. Getting ready for work, you pause in front of the mirror, "Turn red," you say. Your shirt changes from sky blue to deep red. Tiny preprogrammed electronics are rearranged in your shirt to change its color. Looking into the mirror, you find it hard to believe that you are 40. You look much younger. With amazing advances in medicine, people in your generation may live to be 150 years old. You're not even middle-aged. As you go into the kitchen and prepare to pour your breakfast cereal into a bowl, you hear: "To lose weight, you shouldn't eat that," from your shoes. They read the tiny electronic code on the cereal box to find out the nutrition details. You decide to listen to your shoes. "Kitchen, what can I have for breakfast?" A list of possible foods appear on the counter as kitchen checks its food supplies. "Ready for your trip to space. You ask your son and daughter." In 2005 only specially trained astronauts went into space -- and very few of them. Today anyone can go to space for day trips or longer vacation. Your best friend even works in space. Handing your children three strawberries each, your add, "The doctor said you need these for space travel." Thanks to medical advices, vaccination shots are a thing of the past. Ordinary foods contain specific vaccines. With the berries in their mouths, the kids head for the front door. It's time for you to go to work. Your car checks your fingerprints and unlocks the doors. "My office. Autopilot," you command. Your car drives itself down the road and moves smoothly into traffic on the highway. You sit back and unroll your e-newspaper. The latest news downloads and fills the viewer. Looking through the pages, you watch the news as video films rather than read it.
Answer: The medicine.

SOLUTION:
What changes the color of your shirt?