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.

[Q]: Article: A father wanted to buy a horse for his son. After looking at many horses, the man's decision was almost made. It had come down to a choice between two horses. They were quite similar and the prices were the same. He decided to take another look so he could make a final decision. The first farmer was eagerly trying to sell his horse and talked much about how cute his horse was, but the father didn't reach a decision. The second farmer was different. He didn't say anything about the horse, but he simply said that he was sure the man's son would love his horse. He offered to bring the man a saddle , a bridle , the horse and enough food for it for 30 days. In return , the father should give him a check, and he would hold it for 30 days. If the man's son decided to keep the horse, he could let him know at the end of the 30 days, and he would cash the check. Otherwise, he would give back the man's check, pick up the horse and even clean up where the horse had been to. Which farmer do you think sold his horse? Can you see that if you promise buyers reliable business dealings with you, you are more likely to be successful? The farmer gave more far beyond what the father thought or even imagined.
Answer: The two horses were quite similar.
[A]: Why was it hard for the father to make a decision at first?

[Q]: Article: Hans Christian Andersen put Denmark on the map of the world literature with his stories The Emperor's New Clothes,The Little MermaidandThe Ugly Duckling. Now Copenhagen, the country's capital, has become the center of the world political map, with 190 world leaders attending the climate talks there, not to mention thousands of reporters. Just how much do you know about the Scandinavian country? Denmark is famous for its design culture. At the heart of "Danish Design" is the idea that, as poet and designer Piet Hein puts it: "There is one art, not more, nor less, [and that is] to do all things with artlessness ." Danish design places equal emphasis on practicality and quality. From Lego toys to furniture, Danish products are known for their clean lines, simplicity and functionality. "Remove material where it's not needed. Keep things simple and functional and make them carefully," explained Hans J. Wegner, the first Danish designer to achieve worldwide fame: "The aim is not to create a work of art, but to produce a good chair." "The Danes have done a better job than most in promoting arts in Europe, considering their country's size and population, in the fields of architecture, sculpture and design," writes Helena Smith, reporter with British newspaper the Guardian. The simplicity of Danish design may extend to the quality of life there. Some even claim that the Danes have the highest quality of life of any nation in the world. Kate Vial, a 55-year-old American who has lived and worked in Denmark for more than 30 years, explaining why she chooses to live in Denmark rather than the US, told Germany's biggest news weekly Der Spiegel: "I just chose a simpler lifestyle, one where I could ride my bike all over and where I don't have to make a great living to survive."
Answer: To arouse readers' interest in Denmark.
[A]: What's the writer's purpose of mentioning Denmark's literature?

[Q]: Article: Many kids turn up their noses at the thought of eating fish because, well, it can smell "fishy". While it is usually a healthy source of protein in the diet, there may be several reasons to avoid biting into a forkful of fish. Before you break out the tartar sauce, learn some facts about fish to keep yourself and the environment healthy. Some fish may contain harmful chemicals, which can be the result of both natural causes and water pollution. Mercury is a poisonous chemical, which occurs naturally in oceans and the Earth's crust, but also comes from man-made sources, such as pesticides, burning garbage, and the releasing of fossil fuels. Polychlorinated biphenyls (PCBs), a group of chemicals, can also be found in some fish. These dangerous man-made chemicals were used in many industries until 1977, when they were banned. PCBs were released or leaked into the air and water and have been transported around the globe. How do mercury and PCBs end up in fish and the food supply? When they are released into the air, they attach themselves to particles. These particles settle on the ground and in the water and are eventually eaten by microscopic organisms. Small fish eat the micro-organisms, and large fish eat the small fish and on up the food chain. Because they can negatively affect your health, the U.S. Environmental Protection Agency advises that kids younger than 15 years old avoid fish that contain high levels of mercury and PCBs. These include shark, swordfish, king mackerel, and tilefish. There are also many types of fish that are good for you, but because of overfishing are in danger of being wiped out. Some are being fished in the wild so much that they cannot reproduce fast enough to survive. Others are being farmed in ways that are not environmentally friendly. These fish include red snapper, Atlantic salmon, blue-fin tuna, and king crab. Despite these problems, there are several fish that are both healthy and sustainable, such as Alaskan salmon, American catfish, Pacific cod, and several farm-raised fish and shellfish.
Answer: Mercury and PCBs--particles -- organisms-- fish -- food supply
[A]:
How do mercury and PCBs come to our food supply?