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

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Article: A couple had a son eleven years after they married. They were a loving couple and the boy was _ . When the boy was around four years old, one day the father was very tired after work so he asked his wife to pick up their son. The mother, who was very busy in the kitchen, totally forgot about it. Later the boy lost his way on the street. When the son was found missing, the mother hurried to look for him, but she didn't find him. The mother felt very sad and didn't know how to face her husband. When the father went to the police station after hearing that the son was missing, he looked at his wife and said just four words. What do you think the four words were? The husband just said "I love you, darling." www.zxxk.com The son was missing. If she had picked him up earlier, this would not have happened. There is no point in blaming anyone. His wife had also lost her only child. What his wife needed at that moment was comfort and understanding from her husband. That is what the husband gave his wife. Several weeks later, with the help of the police, the couple finally found their lost son. The family's relationship became stronger over that time. Sometimes we spend lots of time asking who is to blame. We miss many chances to give each other support and let each other feel the warmth of human relationships. Get rid of all your unwillingness to forgive, selfishness, and fears and you will find the world is much more wonderful.
Answer: He was too tired to do it.
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Why didn't the father pick the boy up himself?

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Article: The best UK cottages for Christmas and New Year _ It's a solid little Victorian gatehouse outside Ballycastle. It has an association with Irish nationalist Roger Casement. Close to the Causeway Coast, the closest beach is five minutes' drive away. It is a good choice for those who want to avoid stairs, since all the main rooms are on the ground floor. Sleeps 2 adults + 2 children, PS730 a week at Christmas or New Year (three nights from PS389), 353 1 670 4733, irishlandmark.com _ It is located in a peaceful island, where a priory was built 1,400 years ago. Guests at Coastguard's Cottage, the latest addition to English Heritage's portfolio of holiday houses, can explore the priory ruins. The attractive whitewashed house is decorated with calming tones and contemporary furnishings and has views of Lindisfarne Castle. Sleeps 6, PS1,600 a week from 19 Dec, 0370 333 1187, english-heritage.org.uk _ It sits on a 350-acre private nature reserve. Surrounded by woodlands, wetlands and wild meadows, it's a heaven for wildlife. You might meet a few animals on a walk around the reserve. Built by local craftsmen using natural materials, it is a light-filled living space with huge windows, a woodburner and other essential for winter evenings -- a home cinema system. Sleeps 6, PS1,430 a week from 29 Dec, 01580 720770 kentandSussexcottages.co.uk _ In snowy winter, the quiet 16th-century cottage near Stowmarket is like a perfect picture on Christmas cards. The inside is also appealing, with a big farmhouse kitchen, antique furniture, comfortable carpets and an impressive fireplace. A good selection of films, music and books are provided. Approached via a single track lane, the cottage sits in three acres of wild meadow, surrounded by plenty of farmland. Sleeps 5, PS1,003 a week from 30 Dec (three nights PS725), 01787 211115, grove-cottages.co.uk
Answer: PS730.
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How much will be charged if a couple with two children stay in Victorian gatehouse for a week at Christmas?