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.

Example Input: Article: Last week, I bought an alarm system for about $ 450. It consisted of a control unit with three other small units. I put the control unit in the sitting room and fastened the other units by the front door, back door and living-room windows. The instructions told us to choose three numbers, so we chose 491, the last three numbers of our telephone number. Now I must explain how the alarm works: 1. There is a power siren in the control unit. It makes a very loud noise. 2. Each of the small units sends out beams or rays in different directions. If anything moves, it breaks a beam. This sends a signal to the control unit. The siren makes a noise that you can hear 50 meters away. 3. When we go to bed, I press the three buttons numbered 4, 9 and 1. Then we have 30 seconds to get out of the room before the alarm starts to work. That might I slept soundly because I was sure that no burglar could get into our house. However, at about 2:10a.m., I woke up and heard the siren . "There must be a burglar in the house," Mary said. "What shall we do?" "I'll go and see who's there," I said. "Stay here. Don't make a noise." I went downstairs quietly. When I reached the living room, I switched on my torch and looked round the room. Then I turned the light on. I switched the siren off and searched the rooms downstairs. There was nothing wrong except that the back door was unlocked. I locked it, re-set the alarm and went back to bed. About an hour later, the alarm started again. I jumped out of bed, fell over a chair in the dark and bumped into the bedroom door. Mary woke up and started hitting me with a torch. "Hey! Wait a minute!" I whispered. "It's only me. I' m going downstairs to see what's wrong." I went down into the living room and listened for a moment. The only sound I could hear was the siren. I turned on the light and then switched the siren off. As I did so, I glanced across at the curtains in front of the windows. I saw a house lizard disappear behind the curtains. "Oh!" I said to myself. "That's our burglar." When the lizard moved, it started the siren. I guessed that the alarm had been made in Europe, where there are no house lizards. Well, I won't finish this story but if you want an alarm system free of charge, let me know. I'll send you ours. We bought a dog this morning. It knows the difference between a lizard and a burglar.
Question: The writer bought an alarm system to _ .
Options: (A) make sure that he got up early every day (B) warn him when there were lizards in his house (C) frighten burglars and tell him that somebody had got into the house (D) make Mary feel safe to live in the large room
Example Output: C

Example 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%.
Example Output: A

Example Input: Article: Shanghai Air & Hotel with Transfers/One Day Hangzhou City Tour(PK0482737SHA06) Package Inclusive *Return Air Tickets *2 Nights Accommodation *Return Airport Transfers *One Day Hangzhou City Tour Booking Period:29 Jan 2015 to 31 Dec 2015 Travel Period:29 Jan 2015 to 31 Dec 2015 ONE DAY HANGZHOU CITY TOUR It is a city rich with history and culture,spanning back over 2000 years.With its inviting views and outstanding scenery,the area soon became popular with artists,poets and painters seeking inspiration in this little bit of paradise. Our first stop is Six Harmonies Pagoda.You will get to visit the charming museum and snap some photos in front of this architectural marvel that was built in the Song Dynasty. Next stop will be a visit to Meijiawu Tea Village,for a traditional tea ceremony and its significance to Chinese culture. After lunch,the beautiful view of West Lake is going to greet us.We will have a cruise across West Lake to experience peace and serenity like no place else in the Shanghai area.The unforgettable scenery includes Three Pools Mirroring the Moon,Bai and Su Causeways,Solitary Hill,and Leifeng Pagoda,etc.The boat ride ends at Viewing Fish at Flower Harbor.We will have the chance to walk along on Su Causeway,and feed the fish in the Red Fish Pond to pray for the good luck. Pickup Time:Between 7:30 a.m.--8:30 a.m. Duration:10 hrs 2--WAY SHANGHAI PUDONG INTERNATIONAL AIRPEIRT TRANSFERS Transfer between Shanghai Pudong International Airport(PVG) to your hotel is provided by mini bus.On arrival,you will be met by our driver after custom clearance. Should you require further assistance,please contact our hotline:+86 21 6322 3855
Question: What service will you get from One Day Hangzhou City Package Tour?
Options: (A) Round-trip air tickets. (B) One day accommodation. (C) Free food service. (D) Force-shopping.
Example Output:
A