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: It's a fact that we all dream. Some dreams seem to last for hours, others only for seconds. Some of us have strange dreams, some have interesting dreams, and some of us have unpleasant dreams. Tests in the 1980s showed that these dreams occur within 90-minute cycles, each cycle made up of six stages. In the last stage people experience rapid eye movement, known as REM, and it is in this stage that dreaming takes place. Eighty percent of people who were woken during this sixth stage could easily remember their dreams. On the other hand, when during the first five stages (NREM), only seven percent could describe a dream. However, of these same people woken during the first five stages, 74% were able to remember thinking activity, although they would not call it a dream. NerysDee, who has written about dreams in a book called "Your Dreams and What They Mean" says: "Perhaps during NREM sleep we are sorting out our outer mundane problems, but in REM sleep we are dealing with inside matters." She also makes the following statement about 90-minute cycle: It may also prove the reason why _ who wake in the middle of the night find it impossible to get to sleep again for at least an hour and a half. In other words, until they have missed out one complete 90-minute sleep period.
Question: Which of the following statements about dreams is TRUE?
Options: (A) Everyone dreams but very few can recall what they dream. (B) Some people have long dreams and others have very short ones. (C) People can only remember unpleasant dreams. (D) More than eighty percent of people can remember their dreams.

Output: B

Input: Consider Input: Article: Nathan's second-hand bike was good enough to get him anywhere he wanted to go. Of course, it couldn't match Tim's in a normal speed race, but all the fancy gears in the world wouldn't get you up Black Mountain. It was so steep in places that you had to get off your bike and push. On this particular afternoon, the odds were all on Nathan's side. First, he was stronger. Tim had always been thin, but recently he'd started to grow so fast that his arms and legs were like pieces of spaghetti. As well as being considerably fitter than his friend, Nathan knew the shortcuts up prefix = st1 /BlackMountain. So when Nathan accepted the challenge, he was sure he'd win. He nearly always did, in competitions with Tim. That was what was strange. Tim was so competitive, and yet he wasn't any good at physical things. By the time the two boys were three quarters of the way to the top, Nathan was clearly ahead. While the road zigzagged back and forth up the mountainside, in certain places, there were also vertical tracks, where water rushing down the slope in winter had bitten erosion courses into the soil. These had in turn been so overgrown by bushes and long grass in the spring that they looked like tunnels through the bush. The trick was to know where you could cut off a whole bend in the road by leaving the road and pushing your bike up one of these half-hidden pathways. If you chose the wrong one you'd struggle up for ten minutes and then suddenly reach a dead end. Then there was no choice but to go back.
Question: What did Tim challenge Nathan to do?
Options: (A) test who had the fastest bike (B) decide who was the most competitive (C) find the secret tracks on the mountain (D) race to the top of BlackMountain

Output: D

Input: Consider Input: Article: For as early as I could remember, my mother had been a bright, cheerful woman deeply interested and involved in the world around her. However, in the last fifteen years of her life, she had to live with senile dementia . I would go to my home to pay her a visit in California and she would curiously look at me and then ask, "Who are you?" I would answer, "I'm your own son, of course." "Where do you live?" She would ask. "In Virginia", I would tell her. "Isn't that interesting," she would say, "I have a son in Virginia." Mother seemed only forgetful as well as confused at the beginning of that disease, but sometime later she would go through different time of intense anxiety. She would keep walk ing through the house she used to live in most of her life crying uneasily that she would like to go home. Or sometimes she left home and wandered away if she were unattended for a short time. Hoping to make her happy and put her mind at ease I would take her in my car, visiting sites where she used to live when she was a child. In the yard of the hillside house in Shipman I sat in the car and admired the view of the old oaks and long green lawn . I _ my mother there was a little girl playing with the pet lamb she had been so fond of. I looked to her for some response. She shook her head and said, "I want to go home." Over the years I have decided that what my mother was calling home was not a place, but a time. I think it was a time when she was much younger, when her children were still underfoot, when her husband was still energetic and attentive. Watching my mother's suffering set me wondering where I would have in mind if someday I couldn't find home and wanted to go there. In this family we tend to be long-lived and we grow fuzzy minded as the years go by. At eighty I have already noticed some alarming symptoms. My doctor says the forgetfulness is only natural and that it comes with age. Still the fear of senile dementia is haunting there. Someday if and when I become even more cloudy minded than I am now, unable to drive and unable to tell you where "home" is, my dear son, I expect I will ask you to take me home, I know you will do your best to find the place I need to be. I leave these notes for your guidance.
Question: Which of the following is NOT the symptom of the mother of the author?
Options: (A) forgetful (B) confused (C) cheerful (D) uneasy
Output: C