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: Do you enjoy seeing the stars twinkling at night ? Or do you love the ocean and sea, diving and racing with lovely dolphins? With heavy burdens on their shoulders, teenagers find it hard to pull out. Even if they are free, they prefer to occupy themselves with computer games or watching TV. How to get children away from screens is a great concern for parents. Now there is some good news for those concerned parents and teachers. A campaign is being launched to encourage children to surrender 30 minutes of screen time a day to head for the great outdoors. The newly formed Wild Network - a collaboration of nearly 400 organizations - is attempting to attract youngsters away from television and computer screen and into fields, woods and parks. Organizers say it is the UK's biggest ever campaign to reconnect children with nature and outdoor play, and claim it could help improve fitness, mental alertness and general well-being. A documentary film, Project Wild Thing, will herald the launch at more than 50 cinemas across the UK from Friday. It looks at the increasingly fragile link between children and nature. Members of the network include the National Trust, RSPB, Play England and the NHS sustainable development unit. Andy Simpson, chairman of the Wild Network, said: "The tragic truth is that kids have lost touch with nature and the outdoors in just one generation. Time spent outdoors is down, roaming ranges have fallen drastically, activity levels are declining and the ability to identify common species has been lost." Suggestions of how to get more time in nature include collecting conkers , camping or snail racing, and observing autumn colour on trees. From January, the network will aim to make suggestions to politicians on how government can do more _ This is not the first time the message of less screen, more play has been brought up. Children in the 1980s were entreated to do the same by the BBC TV series Why Don't You, which somewhat confusingly called on its viewers to "switch off your TV set, and go do something less boring instead".
Question: What is the main purpose of the campaign in UK?
Options: (A) To save 30 minutes for watching TV programme each day. (B) To encourage children to play outdoors. (C) To see the documentary film, Project Wild Thing. (D) To teach students how to learn more efficiently in schools.

Ex Output:
B

Ex Input:
Article: Life in space will certainly take some getting used to!But the space station has been designed to keep the astronauts as comfortable as possible--the modules are roomy,bright,and kept at a constant 70 degrees Fahrenheit.It's important the crew members are comfortable because they'll be busy aboard the station.In a typical workday,crew members will spend 14 hours working and exercising,1.5 hours preparing and eating meals,and 8.5 hours sleeping.Here are some other fun facts about life aboard the station: Food Come mealtime,astronauts will have a special dining kitchen.Space food just keeps getting better--and more like food we enjoy here on Earth.In early space missions,astronauts could eat only freezedried food that didn't require any preparation.But the space station is equipped with water,microwave ovens,and refrigerators,allowing the folks on board to eat more "normal" types of food,including fruit,vegetables,and ice cream! Sleep Each crew member has a private room.With no gravity,they'll need to tie themselves to their beds,or they will float away!That might sound like a strange way to sleep,but astronauts from past space missions report that sleeping in space is actually pretty great! Exercise You might not think it,but exercise is even more important on the station than it is on Earth.There is not much gravity in space.Astronauts don't stand up,sit down or walk in space,so their muscles and bones don't have to work much--and this muscle and bone loss can be dangerous back on Earth.To fight this,astronauts on the station will exercise on bikes,rowing machines,and other equipment about two hours every day. Clothing Astronauts will have to wear special space suits while traveling aboard the U.S.shuttle or Russian rockets.But once they're safe inside the space station,crew members can wear regular clothing.Of course,a specially designed,pressurized space suit is required for space walks.It has to withstand flying pieces and protect the astronauts from dramatic temperature changes.It can range from 120 degrees below Fahrenheit in the shadow of the station to 250 degrees in the hot sun. Personal Cleanliness Simple tasks like brushing your teeth can be challenging in a weightless environment.A little water doesn't flow in a stream--it suspends in a bubble!Astronauts will use a freshwater hose to take showers,shampoo,and wash off--then a second vacuum hose to suction off the dirty water.And how do you go to the bathroom in space?With a special "air toilet" that uses flowing air instead of water to dispose of waste.
Question: The facts about life in space are all mentioned EXCEPT _ .
Options: (A) clothing (B) entertainment (C) sleep (D) exercise

Ex Output:
B