instruction:
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.
question:
Article: Scientists are closely concerned with the structure of buildings and with the quality of building materials. The World health Organization (WHO) observes that the introduction of air conditioning and energy conservation measures have been accompanied by growing problems of indoor air quality. Some pollutants arise from insulation products, some from moving cars, and others from modern housing materials. As many Europeans spend up to 90% of their lives in buildings, the health effects of the indoor climate are very important. Some construction materials, including fiberboard, insulation foams and certain glues for man-made wood floor boards, for example, give out organic products such as formaldehyde . Heat and humidity increase the release of formaldehyde and the gas seriously harms the eyes. Paint, lacquer, etc. can also release dangerous gas into indoor air. Construction materials can cause serious damage, especially when they contain asbestos . Asbestos is naturally present in rock formations worldwide. It belongs to a family of mineral substances made up of solid, non-combustible fiber. These properties make asbestos a highly sought-after construction material. As early as 1931, however, public health officers in the prefix = st1 /United Kingdomrevealed the connection between breathing in asbestos dust and such diseases as lung cancer. The land on which a building is sited may also contribute to pollution. Some kinds of granite or similar rocks contain traces of radium. As it breaks down, this naturally radioactive element produces some kind of radioactive gas that goes through tiny cracks in walls, floors and building materials, and makes its way into the building and the rooms. The better the homes are insulated, the more is the dangerous gas in indoor air. The main effect of this dangerous gas on health is to increase the risk of lung cancer.
Answer: Some factors cause indoor air pollution.
answer:
What is the main idea of the passage?

question:
Article: Backpacking in Europe is a wonderful experience for young people around the world.After high school or university,you can plan a European backpacking trip. Packing As you plan the things you will carry,bring warm clothes and a raincoat or umbrella to deal with changing weather in different European countries.Europeans like dressing nicely,and good clothes will make you feel less like a dusty backpacker.It is not worth taking the trouble to bring a hair dryer or shampoo,as you can buy basic necessities in Europe. Hostels The cheapest places to sleep when backpacking in Europe are hostels(where people can stay and eat fairly cheaply).Most hostels have a lot of information about low-cost ways to see local attractions,and many offer tours.The cost for hostel beds differs from country to country.In Paris,you might pay 30 euros,but in Bulgaria,you can get a bed for 10 euros.In general,hostels are more expensive in large,popular cities such as Paris,Rome and London. Many backpackers use rail passes ,which allow unlimited travel within country groups over a period of time.If you have the time to travel by train and will be traveling in a country group,this can be a good deal.Otherwise,you may consider point-to-point tickets,local trains,buses and airlines such as Ryanair,easyJet and Wizz Air,which offer cheap flights. Food Eating out in Europe can come with a high cost,and the best way to cut your food budget is to cook meals in the shared kitchens in hostels.You can make several meals into picnics to take advantage of Europe's parks.When shopping for your picnic,try and buy at a local market.You save some euros while supporting the local industry at the same time.When eating out,choose restaurants away from tourist attractions.
Answer: They always ask the same price for their beds.
answer:
Which of the following is an advantage of hostels?

question:
Article: Vitamins are complex chemical substances found in many foods. The human body needs them for health and growth. The body makes some vitamins, but usually in amounts too small to meet its needs. Other vitamins are not made in the body. These must be supplied. No one knows exactly how all vitamins work. Doctors do know that vitamins have very special uses. One vitamin therefore cannot take the place of another. The steady absence of one vitamin in an otherwise complete diet causes a deficiency disease. Rickets, scurvy, and pellagra are examples of deficiency diseases. It is best to obtain vitamins by eating the foods in which they occur. There are also pills that contain a single vitamin or a combination of vitamins people should consult their doctors before they take any vitamin pills. Scientists have discovered about 25 vitamins and their different forms that are very important to human beings and other forms of life. Experts believe that there are many more vitamins to be discovered. There are two basic groups of vitamins. One group of vitamins dissolves in fat and is therefore called the "fat-soluble" group. Vitamins A, D, E and K are in this group. The other group is known as "water-soluble" vitamins. These vitamins, understandably, dissolve in water. Among this group are Vitamin C and the B group of vitamins. Vitamin A aids the building and growth of body cells. This vitamin is therefore vital for the growth of children and for good development of babies before birth. Vitamin A is also important for good vision at night. Vitamin B1 is also called thiamine. This vitamin prevents and cures disease. Vitamin B2, called riboflavin, is needed for growth, healthy skin, and for the eyes. Vitamin C, or ascorbic acid, prevents and cures scurvy. Vitamin D is a group of 10 vitamins that prevents rickets. Scientist believe that Vitamin D3 forms in the skin when the body is exposed to sunlight. Because of this, it is called the "sunshine vitamin". A lack of Vitamin D may lead to bone damage; too much may cause kidney disease. All of the functions of Vitamin E, also called tocopherol, are not known. It is necessary for reproduction in animals. Vitamin K is necessary for making the blood clot. The more that is learned about vitamins, the more it is realized how these chemical substances play a part in all aspects of human activity.
Answer: All of the above
answer:
Which disease is caused because of the steady absence of one vitamin in the diet?