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: (NEW YORK)---Scientists have discovered small signs of awareness in some vegetative brain injury patients and have even communicated with one of them---findings that are beneficial to how to assess and care for such people. The new research suggests that standard tests may ignore patients who have some consciousness, and that someday some kind of communication may be possible. In the strongest example, a 29-year-old patient was able to answer yes-or-no questions by picturing specific scenes the doctors asked him to imagine. "We were stunned when this happened," said one study author, Martin Monti of the Brain Sciences Unit in Cambridge. "I find it really amazing. This was a patient who was believed to be vegetative for five years." Ever since a research paper four years ago described obvious signs of awareness in a vegetative patient, families of patients have been demanding brain scans, said Dr. James Bernat, a spokesman for the American Academy for Neurology. But experts said more study is needed before the specialized brain scans could be used in medical treatment. "It's still a research tool," Bernat said. Experts also pointed out that only a few tested patients showed evidence of awareness. And they said it is not clear what degree of consciousness and mental abilities the signs imply. They also noted that the positive signals appeared only in people with traumatic brain injury---not in patients whose brains had been lacking in oxygen, as can happen when the heart stops. The new study used brain scanning called functional MRI, for 23 patients in a vegetative state and 31 that are minimally conscious. Patients are said to be in a vegetative state if they are tested and found unable to do such things as move on command or follow a moving object with their eyes. Minimally conscious patients show signs of awareness, but they are minimal and discontinuous.
Question: What is the practical use of the research?
Options: (A) It leads to studying how to cure vegetative patients. (B) It attracts society to pay more attention to vegetative patients. (C) It helps doctors know whether patients are vegetative or not. (D) It drives the government to care about vegetative patients.
Example Output: C

Example Input: Article: I was dirty smelly hungry and some somewhere beneath all that, suntanned .It was the end of an Inter-Rail holiday.My body couldn't take any more punishment. My mind couldn't deal with any more foreign timetables, currencies or languages. " _ ," I said, as I stepped onto home ground.I said exactly the same thing the following year.And the next, all I had to do was buy one train ticket and, because I was under twenty--five years old,I could spend a whole month going anywhere I wanted in Europe. Ordinary beds are never the same once you've learnt to sleep, in the passage of a train, the rhythm rocking you into a deep sleep. Carrying all your possessions on your back in a tucksack makes you have a vefy basic approach to travel,and encourages incredible wastefulness that can lead to burning socks that have become too anti-social ,and getting rid of books when finished.On the other hand, _ is entirely in the spirit of Inter--Rail,for common sense and reasoning can be thrown out of the window along with the paperback book and the socks.All it takes to achieve this carefree attitude is one of those tickets in your hand. Any system that enables young people to travef through countries at a rate of more than one a day must be pretty social on that first trip,my friehds mad I were at first unaware of the possibilities of this type of train ticket,thinking it was just an inexpensive way of getting to and from our chosen camp-site in southern France.But the idea of non-stop travel proved too attractive,for there was always just one more country over the border,always that little bit further to go.And what did the extra miles cost us? Nothing. We were not completely uninterested in culture.But this was a first holiday without parents,as it was for most other Inter-Railers,and in organizing our own timetable we left out everything except the most available sights.This was the chance to escape the guided tour,an opportunity to do something different.I took great pride in the fact that.in many places,all I could be bothered to see was the view from the station.We were just there to get by,and to have good time doing so.In this we were not different from most of the other Inter-Raiders with whom we shared passage floors,food and water,money and music. The excitement of travel comes from the sudden reality of somewhere that was previously just a name.It is as if the city in which you arrive never actually existed until the train pulls in at the station and you are able to see it with your own tired eyes for the first time.
Question: At the end of his first trip, the writer said"Never again"because
Options: (A) He fell ill (B) he disliked trains (C) he was tired from the journey (D) he had lost money
Example Output: C

Example Input: Article: On May 18,1969,NASA astronauts Thomas Stafford,John Young,and Eugene Cernan boarded the Apollo 10 lunar module --the fourth manned mission in the US Apollo Space program and only the second after Apollo 8 to circle the moon.Its mission was to circle the moon and thoroughly test the components and procedures to pave the way for the first lunar landing. The mission went perfectly without incident--at least that's what every one believed. However, that view has changed since February 22, after NASA released a digital recording of strange music heard by the space travelers.Then as they were re-entering the zone where they could communicate with ground control.One of the astronauts asked if they should report it.In response, Stafford expressed his doubts if anyone would even believe them.But they needn't have worried. When NASA experts listened to the recordings,they thought the strange sounds were radio interference. Michael Collins--the Apollo 11 pilot--said that the only reason why he was not shocked upon hearing them was that he had been forewarned by NASA officials.Collins also said that the music stopped as soon as the lunar module landed on the moon. So why did it take NASA over 40 years to release the digital recording of the awful music only after it was featured in a recent television series NASA's Unexplained Files? The US Space Agency says they have not been hiding them.In the press release that accompanies the release of the recording,NASA officials state,"The Apollo 10 audio clips were uploaded in 2012, but the mission's sound recordings have been available at the National Archives for anyone that wanted to hear them since the early 1970s." Eugene Cernan, Apollo 10's pilot who heard the sounds first,also released a statement saying,"I don't remember that incident excited me enough to take it seriously.It was probably just radio interference.Had we thought it was something other than that,we would have briefed everyone after the flight. We never gave it another thought." While most people are ready to accept this logical explanation,there are some that believe otherwise. They guess the music proves the presence of aliens. Among them is Apollo 15 astronaut Al Worden,who thinks the sounds came from a source in outer space.In the episode of NASA's Unexplained Files, which discusses the origin of the strange music,the astronaut says, "Logic tells me that if there was something recorded on there,then there was something there."
Question: Apollo 10's mission was to _ .
Options: (A) take the astronauts to the moon (B) detect alien music in outer space (C) prepare for the landing on the moon (D) move around and observe the moon
Example Output:
C