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.

Ex Input:
Article: As the nights get lounger, those who suffer from the winter blues will be planning ways to escape to the sunshine. But there may be a much simpler way of cheering yourself up... simply shining a bright light into your ear canal. Up to one in four Britons suffer from seasonal affective disorder, with seven per cent of the population having full-blown SAD. It is caused by the brain not receiving enough daylight which is needed to trigger serotonin , a hormone that regulates mood. Symptoms range from mild lethargy to depression and insomnia, but a cure might be in sight. Two clinical trials, run by Valkee - who make a device that can shine light into your ear - and the University of Oulu in Finland, have found that carefully targeted light can help prevent the condition. Juuso Nissila, Valkee's co-founder and chief scientist said: "We presented earlier that the human brain is sensitive to light". "These two clinical trials demonstrate that channeling bright light via ear canal into brain's photosensitive areas effectively prevents and treats seasonal affective disorder." The University of Oulu reported that in their first study, 92 per cent of the patients with seasonal affective disorder achieved full remission after a month of daily eight-to-12 minute doses of light from the Valkee. Time Takala, chief physician at the Oulu Deaconess Institute said: "These two trials show that bright light channeled into the brain via ear canal is an important future method to treat seasonal affective disorder." Valkee launched its bright light headset in August 2010. It is classed as a medical device under EU regulations. The device channels bright light direct to the brain via the ear canal to prevent and cure depression, mood swings and even circadian-rhythm disorders such as jet lag. It costs PS185 and looks like an iPod - only the earphones emit light rather than sound.
Question: How many Britons suffer from seasonal affective disorder?
Options: (A) Approximately a quarter. (B) 7%. (C) More than one fourth. (D) 92%.

Ex Output:
A

Ex 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

Ex Output:
C

Ex Input:
Article: Bernie was smart and wanted to be his own boss.When Bernie was 25 he took a wife. Bernie had saved some money and decided on a dry goods and grocery store combined. Marie had a knack for arranging the merchandise to appeal to customers and Bernie didn't mind the long hours. He was happy, and life was good.The business thrived until the great depression hit the entire country. No one had money to purchase pretty things or even food. In 1930, Marie had a heart attack and left Bernie alone. Following Marie's death, which Bernie felt was brought about from worrying about the store, He lost interest in everything. He had few customers and did not make them feel welcome, Bernie wandered about the store , dusting a bit and sweeping the floor. His inventory remained almost the same, as nothing much was sold .A deep depressing set in. He had lost Marie , his true love , and now his business seemed lost as well, Why did he want to live ? A few houses down the street lived a family who had also fallen on hard times. They seldom had three meals a day. Julie , the youngest girl, was fourteen . Julie worried about Mr. Mears' getting so thin. At meal time, she would take a portion of their meal to Bernie. She would stay and talk to him, dusting and cleaning . After several months Bernie began to improve. He still had no customers to speak of, but from what he had left in the stor , he would sack a few cans to take to Julie's family. In early spring, Julie saw her father planting a garden. This gave her an idea. She suggested Bernie making a garden in the big space beside the store, which they had once thought would become a parking lot , and sell the produce really cheap in the store. It would help the neighbors and also Bernie to have money for new merchandise. They would plant half the garden space now and half in three weeks giving them fresh produce for a long time . Julie prayed hard as they placed the seeds in the ground. When the seeds sprouted, Julie looked anxiously at the rows and there were no empty spots. They all came up and produced the best crop of vegetables Bernie had ever seen. They soon became well-known in the community for having the best prices and finest produce in town . They also extended credit to their neighbors and accepted various items as trade for merchandise. The two of them worked hard throughout the 1930s and made a very successful business. Julie earned a salary . As the economy picked up, so did sales at the store.
Question: What's the best title of this passage ?
Options: (A) Mears' Family Store (B) A Neighbor of Mears' (C) The Deep Depression (D) Vegetables in Garden

Ex Output:
A