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 Q]: Article: By 2050 there will have been an extra 2.5 billion people on earth. And what will they eat? To solve the problem, we should have to double our food production. We can also develop a diet of algae , insects and meat grown in laboratories. Algae can grow very quickly at sea, in polluted water and in places that would normally kill food crops. They are already eaten widely in Japan and China and they are eaten by almost everything from shrimps to blue whales. They can fix CO2 in the atmosphere and provide fats and sugars. Man-made meat looks like meat, feels like meat and it is meat, although it's never been from a living, breathing animal. Instead, it is grown from cells in big containers. Moreover, studies show that producing man-made meat will use far less water, energy and land. China has developed "green super rice", a series of rice types which produce more grain and have stronger ability to fight against floods, salty water, insects and disease. We used traditional plant breeding techniques to cross-breed more than 250 rice types. Green super rice, which is enough to feed an extra 100 million people, will be planted widely in the coming years. Insects like ants are not on most European menus but at least 1,400 kinds are eaten across Africa, Latin America and Asia. Now, with rising food prices and worldwide land shortages, such insects are getting more and more popular. Not only are many insects rich in protein , low in fat and high in Ca and Fe, but insect farms need little space. And they can grow well on paper, algae and industrial wastes.
Question: In order to exist in the future, people have to _ .
Options: (A) move to other planets (B) produce rain in laboratories (C) build new laboratories for food research (D) increase the food production or look for other food sources
[EX A]: D

[EX Q]: Article: We are much happier in our new house because it has a large garden, and you know how enthusiastic we both are about gardening. When we moved in a month ago, Mary wanted to get a dog to keep out burglars. However, we finally decided that it would be cheaper to put an iron grille in front of the door and get a burglar alarm. Last week, I went to a shop and bought an alarm for just over PS200. It consists of a control unit with three smaller units. I put the control unit in the lounge and put the other units in place by the front door, back door and lounge windows. That night I soon fell asleep because I was confident that no one could get into our house undetected. At about 1:50 a.m. I woke up suddenly and heard the siren. It was like an ambulance driving right through our bedroom. I couldn't leave the siren on all night. I went downstairs in the dark. When I reached the bottom of the stairs, I switched on the light and looked around. Oh my gosh. The back door was unlocked. I rushed to lock it and it was just at that exact moment that the 'burglar' disappeared behind a curtain. Guess what? It was an ordinary house lizard .Apparently the alarm system had been made for American or European homes in which lizards are never seen. I switched the alarm off and sat down to watch. A few moments later, a lizard ran across a wall, right in front of one of the alarm units. I won't bother to finish this story but if you'd like a burglar alarm system free of charge, just let us know.
Question: What do we know about the author and his wife?
Options: (A) They are pet lovers. (B) They love plants and flowers. (C) They are fond of catching lizards. (D) They hate technology.
[EX A]: B

[EX Q]: Article: In 1905, as part of his Special Theory of Relativity, Albert Einstein published the point that a large amount of energy could be released from a small amount of matter. This was expressed by the equation E = mc2. But bombs were not what Einstein had in mind when he published this equation. In 1929, he publicly declared that if a war broke out he would "refuse to do war service, direct or indirect...." His position would change in 1933, as the result of Adolf Hitler's coming into power in Germany. Einstein's greatest role in the invention of the atomic bomb was signing a letter to President Franklin Roosevelt urging that the bomb be built because some physicists feared that Germany might be working on an atomic bomb. Among those concerned were physicists Leo Szilard and Eugene Wigner. But they had no influence with those in power. So in July 1939 they explained the problem to someone who did: Albert Einstein. After talking with Einstein, in August 1939 Szilard wrote a letter to President Roosevelt with Einstein's signature on it, which was delivered to Roosevelt in October 1939. Germany had invaded Poland the previous month, the time was ripe for action. That October research of a-bomb began but proceeded slowly because the invention of the atomic bomb seemed distant and unlikely. In April 1940 an Einstein letter, ghost-written by Szilard, pressed the researchers on the need for "greater speed". As the realization of nuclear weapons grew near, Einstein looked beyond the current war to future problems that such weapons could bring. He wrote to his friend about his fear about the future use of the a-bomb. The atomic bombings of Japan occurred three months after Germany gave in. In November 1954, five months before his death, Einstein summarized his feelings about his role in the creation of the atomic bomb: "I made one great mistake in my life...when I signed the letter to President Roosevelt recommending that atom bombs be made; but there was some justification---the danger that the Germans would make them?
Question: What can we learn about Szilard and Wigner?
Options: (A) They were not as influential as Einstein. (B) They had cheated their friend Einstein. (C) They were to blame for the invention of nuclear weapons. (D) They had a purpose of destroying the world.
[EX A]:
A