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: The students were not exactly overjoyed that Steve Jobs was going to be the speaker. Everyone wanted Bill Clinton. After all, his daughter Chelsea had gone to school at Stanford. So every year that Clinton was not named speaker was a disappointment no matter who it was. Graduation is not in order. It wasn't until we started walking into the stadium that I even realized that I'm actually graduating right now. Stanford has this tradition, the wacky walk, where everyone dresses up in different clothes or throws Frisbees or beach balls. I'm from the South so I had a seersucker suit shipped in from back home in Georgia. Some other guys dressed up as iPods. It was good fun. That was an interesting contrast to Job's speech. He started talking about being fired from Apple and then having cancer, how doctors told him he was going to die and how he was adopted as a baby into a family with parents who never went to college --- an unusual experience that played out over his life. His speech was very raw and very open. He told us that he gets up every morning and looks in the mirror and asks "If today were the last day of my life, would I want to do what I am about to do today?" "If the answer is not for too many days in a row", he said, "it's time to make a change. That has really driven a lot of my decisions since then. When I've reached certain points in my job where I'm not very excited to get to work early or stay late or work on something over the weekend or all night. When I lose that excitement then it's probably not the right thing for me anymore". He said, "Your time is limited, so don't waste it living someone else's life." Exactly. Death is a great motivator. You have to get out there and do something because some day you won't be there. Of all the advice I've received I rely on that the most.
Question: The students went into the stadium to _ .
Options: (A) dress up in different clothes (B) listen to the speech (C) have the wacky walk (D) throw Frisbees or beach balls

Ex Output:
B

Ex Input:
Article: I went on line to check if my pay was in my bank account . To my amazement I discovered that not only had I been paid, but a company I'd never worked for had also paid me! I know I would have been beside myself if my own salary was not in my account, so I tried to get the money back to the right person. Easier said than done. The bank couldn't help as it "wasn't a bank problem." The human-resource department at the company that paid me was unable to help as I didn't have enough details. I rang the bank again. Thankfully I had a sympathetic call operator who gave me a name, so I again rang the company "Daniel" worked for. I expected the bank would contact me to arrange to take the money from my account and repay Daniel. I heard nothing for a month and the money remained in my account when Daniel called, explaining he'd tried to get back his money but had been unsuccessful as neither the bank nor his company felt it was their error. He had rung to ask if I could speak to the bank, but after chatting for a few minutes we realized we could probably fix this problem ourselves. We decided I would take the money from my account and he would pick it up from me. Due to my busy job I was unable to meet Daniel personally but he left me a lovely bottle of wine in exchange for what was rightfully his. I never had any intention of keeping Daniel's pay but red tape made it difficult to do the right thing. It all came down to two people being able to do what a huge bank and a large company couldn't do -- admit a mistake has occurred and fix it.
Question: What was the attitude of the author towards the extra money in his bank account?
Options: (A) He didn't know what to do with it. (B) He felt lucky to get it. (C) He thought of keeping it for himself. (D) He wanted to return it to the right person.

Ex Output:
D

Ex Input:
Article: Recent research has claimed that an excess of positive ions in the air can have an ill effect on people's physical or psychological health. What are positive ions? Well, the air is full of ions, electrically charged particles, and generally there is a rough balance between the positive and the negative charged. But sometimes this balance becomes disturbed and a larger proportion of positive ions are found. This happens naturally before thunderstorm, earthquakes when winds are blowing in certain countries. Or it can be caused by a build-up of static electricity indoors from carpets or clothing, or from TV sets, duplicators or computer display screens. When a large number of positive ions are present in the air many people experience unpleasant effects such as headaches, fatigue , excessive anger, and some particularly sensitive people feel sick or even suffer mental disturbance. Animals are also affected, particularly before earthquakes, snakes have been observed to come out, rats to flee from their burrows, dogs howl and cats jump about unaccountably. This has led the US Geographical Survey to fund a network of volunteers to watch animals in an effort to foresee such disasters before they hit vulnerable areas such as California. Conversely, when large numbers of negative ions are present, then people have a feeling of well-being. Natural conditions that produce these large amounts are near the sea, close to waterfalls or fountains, or in any place where water is sprayed, or forms a spray. This probably accounts for the beneficial effect of a holiday by the sea, or in the mountains with streams or waterfalls. To increase the supply of negative ions indoors, some scientists recommend the use of ionisers. They claim that ionisers not only clean and refresh the air but also improve the health of people sensitive to excess positive ions. Of course, there are the detractors, other scientists, who dismiss such claims and are skeptical about negative/positive ion research. Therefore people can only make up their own minds by observing the effects on themselves, or on others, of a negative rich or poor environment. After all it is debatable whether depending on seismic readings to anticipate earthquakes is more effective than watching the cat.
Question: What is an ion according to the passage?
Options: (A) It's a charged particle. (B) It's basically static electricity indoors. (C) It's a balance between the positive and negative charged. (D) It's an ill effect on people's physical and psychological health.

Ex Output:
A