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: Robert Frost was at heart a mean-spirited human being, not the kind of man one would expect to write poetry. He was born in San Francisco. Frost entered Dartmouth University in 1893, but dropped out, and switched to Harvard, which he attended for two years. He started a brief teaching career, where he was inspired to become a poet by some of his students' work. Frost stopped teaching and became a farmer. During this time he wrote numerous poems, and a couple of short stories. While he was a farmer he started to think seriously about becoming a famous poet. In almost all of his poems, Frost wrote in the first person. The first widely-read poem that he published was called My Butterfly. At first his audience was very small, but with his Collected Poems he became famous. Robert Frost received almost all the awards that there were for poetry. His poetry describes the forces of nature, and the violence and deep emotional needs of human beings, which reflect the experiences of his childhood. Robert Frost will always be known as one of the best poets in history. His way of putting emotion and violence into words is remarkable . His talent for poetry is natural-born and he had discovered this when he started to farm. Even though he treated his wife and children terribly, he still became one of the best-known poets of his and our day.
Question: We can learn from the passage that _ .
Options: (A) Robert Frost had been a famous writer before he started teaching (B) Robert Frost wrote his poems mostly in the first person (C) Robert Frost was very famous at the beginning of his writing career (D) Robert Frost began to write poems when he was a teacher
Example Output: B

Example Input: Article: I moved to this area seven years ago. For years I have had noisy neighbours. Ever since I moved into this flat, I've had to put up with noise during the night. I decided I'd had enough and I've been looking for a new flat since the beginning of the year. I haven't found anything till now. Every week I go to the estate agent's office, but it's the same story. "I might have something by the end of the week" he says, or, "Wait till next week. I think I might have a few flats by then." I've seen a few flats during my search, but I don't like any of them. One flat I saw has been empty for two years. "It's got a busy road on one side and a railway on the other!" I said loudly, "I want peace and quiet." Last week I visited the agent again. "I won't leave till you show me something," I said. "I've got just the flat for you." I went to see it and I was frightened. "But it's next to a cemetery!" I cried. "But you won't have noisy neighbours," my agent said. "It's exactly right for peace and quiet!"
Question: The writer has had to bear the noise in this area for _ years.
Options: (A) about seven (B) six (C) nine (D) four
Example Output: A

Example Input: Article: An early invention by Albert Einstein has been rebuilt by scientists at Oxford University. They are trying to develop an environmentally friendly refrigerator that runs without electricity. We all know that modern fridges cause damage to the environment. They work by using a kind of man-made greenhouse gas called Freon , which is far more damaging than carbon dioxide. Now Malcolm McCulloch, an electrical engineer at Oxford, is leading a three-year project to develop appliances that can be used in places without electricity. His team has completed a prototype of a fridge patented in 1930 by Einstein. It used only pressurized gases to keep things cold. The design was partly used in the first refrigerators, but the technology was dropped when more efficient compressors became popular in the 1950s. That meant a switch to using Freon. Einstein's idea uses butane and water and takes advantage of the fact that liquids boil at lower temperatures, when the air pressure around them is lower. "If you go to the top of Mount Qomolangma, water boils at a much lower temperature than it does when you're at sea level and that's because the pressure is much lower up there," said McCulloch.At one side is the evaporator , a bottle that contains liquid butane. "If you introduce a new vapor above the butane, the liquid boiling temperature decreases and, as it boils off, it takes energy from the surroundings to do so," says McCulloch. "That's what makes it cold." The gas fridges based on Einstein's design were replaced by Freon-compressor fridges partly because Einstein's design was not very efficient. But McCulloch thinks that by changing the design and replacing the types of gases used it will be possible to quadruple the efficiency. However, McCulloch's fridge is still in its early stages. "It's very much a prototype," he said. "Give us another month and we'll have it working."
Question: According to the passage, an early invention by Albert Einstein _ .
Options: (A) has been rediscovered because it costs much less and works more efficiently (B) is being redesigned because it could be used in places without electricity (C) has just been found to be energy-saving and environmentally friendly (D) will be fully made use of and become the fridge of the future
Example Output:
B