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: 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
Example Output: D

Example Input: Article: One day the employees of a large company in St Louis,Missouri returned from their lunch break and were greeted with a sign on the front door. The sign said:"Yesterday the person who has been hindering your growth in this company passed away. We invite you to join the funeral in the room that has been prepared in the gym." At first everyone was sad to hear that one of their colleagues had died,but after a while they started getting curious about who this person might be. The excitement grew as the employees arrived at the gym to pay their last respects. Everyone wondered:"Who is this person that was hindering my progress? Well,at least he's no longer here." One by one the employees got closer to the coffin and when they looked inside it they became speechless. They stood over the coffin,shocked and in silence,as if someone had touched the deepest part of their soul. There was a mirror inside the coffin:Everyone who looked inside it could see himself. There was also a sign next to the mirror that said. "There is only one person who can set limits to your growth:it is YOU." You are the only person who can revolutionize your life. You are the only person who can influence your happiness,your realization and your success. You are the only person who can help yourself. Your life does not change when your family changes,when your friends change,when your boss changes,and when your company changes. Your life changes when YOU change,when you go beyond your limiting beliefs,when you realize that you are the only one responsible for your life.
Question: The writer's purpose in writing the article is to tell us that _ .
Options: (A) the harder we work,the more successful we will become (B) our work and life are closely connected with others (C) changing our lives is down to us (D) we will have a better future if people do not hinder our development
Example Output: C

Example Input: Article: I got a guitar for my birthday, and since then I have been struggling. It's kind of sad. To be honest, it is surprising how many problems are caused by such little things in the life of a teenage . It has awakened another side of myself within me. And it couldn't have happened at a worse time. I'm a senior. I'm going to graduate soon and I know what college I'm going to. And now I have to deal with the little voice in my head constantly reminding me that I'm going to be a rock star., not a scientist. So you can see my problem. A few weeks ago I was given the seemingly simple task of writing a short story. No specifics, no strict rules on organization. Just write. So I sat down to create a beautiful work of fiction that would surprise my teacher and classmates. To be honest, this is an area I generally feel very strong in. Writing , that is. I really enjoy it and such writing tasks used to take the least amount of time. So I was trying to write my story, and across the room lies my beautiful birthday present. "Once upon a time," I wrote. Then I stopped, turned in my chair, and stared for a moment at the instrument. And then my reflection started dancing and singing. I wasn't moving, but it sure was.. So I grabbed my guitar and plucked a string . The note sang out pure and heavenly, and there was no stopping what was coming. I sat rocking with my guitar until late into the night. I was sure I was preparing for the future much more efficiently now that I wasn't spending time writing stories. Needless to say, no story was written, and many doubts arose in my mind. Since then, I have constantly asked, "Am I normal for not wanting to do my work anymore?" More importantly, though, I learned I am really going to be a rock star.
Question: What's the best title of the passage?
Options: (A) Birthday present offers new direction in life (B) How I become a rock star (C) The guitar for my birthday (D) My writing work
Example Output:
A