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: Article: Homework can put you in a bad mood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay.
Question: Researchers did experiments on kids in order to find out _ .
Options: (A) how they really feel when they are learning (B) whether mood affects their learning ability (C) what methods are easy for kids to learn (D) the relationship between sadness and happiness
Example solution: B
Example explanation: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment. So, B is the correct answer.

Problem: Article: A boy won the grand prize at the 2012 International Science and Engineering Fair, the largest high school science competition in the world. The Maryland teenager Jack Andraka is the youngest winner of the $75,000 prize. He was chosen from among l,500 students in 70 countries. Jack invented a test for pancreatic cancer( ). He started to learn it after losing a close family friend to the disease. "I went on the Internet and I found that 85 percent of all pancreatic cancers are found late, when someone has less than a 2% chance of survival he says. "and I was thinking, 'That's not right and we should be able to do something."' He found that early discovery is important to increase the chances of suryiving the disease. Jack asked to work in a laboratory at Johns Hopkins University in Baltimore and was allowed. There he developed a simple paper test. which can recognize the disease in a single drop of blood. His test has proven correct 90% of the time. It also is 100 times more sensitive than other tests. "It costs 3 Jack's success wouldn't have been possible without Anirban Maitra . a professor at Johns Hopkins, who was the only person among the 200 researchers Jack wrote to and who showed interest in his project "I was very surprised that it was a 15-year-old who was writing this. I wanted to meet this clever young man and see what he wanted to talked about. so I called for him over for an interview," Maitra said. Jack worked in Professor Maitra's laboratory completing his project in 7 months. The government bas given the Maryland teenager patent rights to the pancreatic cancer test. He is now talking with companies about developing the test into a simple product . Whatever happens, the professor believes that Jack Andraka's name is one we will be hearing again over the next 10 to 20 years.
Question: What made Jack Andraka research pancreatic cancer? _ .
Options: (A) A high school task. (B) A professor's encouragement (C) The loss of a friend. (D) Doubts about the present test.
Solution: C