In this task, you're given an article, a question which often contains a blank and four options (associated with "A", "B", "C", "D"). Your task is to find the correct answer (from the given options) for the question from the given article and return one of the options from "A", "B", "C", and "D". Do not generate anything else apart from one of the following characters: "A", "B", "C", "D". There is only one correct answer for each question.

Input: Consider Input: Article: Trees are useful to man in three important ways: They provide him with wood and other products; they provide him shade;. and they help to prevent droughts and floods. Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important.In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear. This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil allowing the rain to sink in and also bind the soil, thus preventing it from being washed away easily;but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When the top-soil is gone, nothing remains but worthless desert. Two thousand years ago,a rich and powerful country cut down its trees to build warships, with which to gain itself an empire .It set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation .
Question: The most important service of trees to man is that _ .
Options: (A) they give them wood and other products (B) they give them shade (C) they help him prevent droughts and floods (D) they help him made money

Output: C

Input: Consider Input: Article: All plant cells are capable of taking up water. Even dead ones do to a certain degree. Absorption of water by dead cell walls makes wood become larger. In common land plants, the living cells of roots take upmost of the water. Land plants without roots do exist, however. Those greenish-yellow lichens you see on rocks in the high mountains have no roots. Half a billion years ago, when water plants started to enter the land, the first land plants did not have roots. Even among the flowering plants, one finds rootless forms. These flowering plants are "the higher plants" because they evolved recently and are thus considered higher on the evolutionary scale . In the Peruvian desert, there grows one of these rootless higher plants, a bromeliad. It is a relative of the pineapple. Even if this plant had roots, they would be of no use, because where the plant grows, it never rains. The plant gets its water only from the dew it collects at night, when its leaves cool off. Such rootless plants, of course, can be moved with ease, but they will only grow when they are placed out in the open. If they are placed too near a house, the radiation from the heat of the house prevents the leaves from cooling and so prevents dew from forming, and the plant dies. In the southern United States and in Puerto Rico, one sees growing high above the streets on the insulation of electric wires. These plants get their water from rain, and the only soil they ever come in contact with is the dust that may blow on their leaves.
Question: Wood becomes larger because of _ .
Options: (A) dead cell walls (B) water entering dead cells (C) the growth of cells (D) the death of cells

Output: B

Input: Consider Input: Article: Who we are Shanghai Super Star provides combination service including translation and tourism and sourcing, focusing on interpreting and translation. Our professional team offer highly professional business interpreters, assistants, companions and exhibition translators and sourcing for a variety of business requirements as well as tour guides to first-time tourists coming to China. Why choose us ^ Our professional and experienced business interpreters/translators have more than 5 years' experience and also have professional education background like business, foreign trade, management etc. ^ Our knowledgeable and enthusiastic private tour guides are always ready to help design your unique trip. ^ Our reliable interpreters have solid experience in different industries. So we will be your great choices when you need interpreters for trade shows, trade fairs, exhibitions or you need business assistants for your business trip like supplier meetings, factory visiting, project negotiation etc. ^ We are always ready to help you go through the language barrier and cultural understanding, and stand by your side and consider everything in your position. ^ When you have finished your business trip, you still have professional Chinese team to support you for goods inspection, shipping arrangement or other service you need. ^ We provide one-stop service for personal holidays or business trips within Great China&Hong Kong Area. From our customers I had the pleasure of working with Susan on multiple trips to Shanghai. Susan is very professional and likes her job. Having Susan as our translator made the trip enjoyable. I look forward to working with Susan on our next trip. --Gary Lennox (USA) In every respect, Susan did an excellent job as our interpreter. She was always friendly and professional, so everyone felt comfortable working with her. And she had no problem communicating clearly about technical subjects and sensitive business issues. I recommend Susan to any companies doing business in Shanghai and nearby cities. --Joe Abelson (USA)
Question: Which of the following descriptions about Shanghai Super Star is NOT true?
Options: (A) It serves customers both at home and abroad. (B) It can provide business assistants if necessary. (C) Interpreting and translation are its main business. (D) Its interpreters and translators are all English majors.
Output: D