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: People like to look in the mirror often when they have a young and beautiful face. However, when one grows old, nobody wants to see their wrinkled old face in the mirror any more. So, many old people seldom look at their faces in the mirror. This is completely wrong. According to Wu Zhenyun, a professor from the Psychological Research Institute under the Chinese Academy of Sciences, a person's willingness to look in the mirror can reflect his or her mentality. When people don't care too much about their age, they will try to carry themselves with ease and natural poise . They don't mind looking in the mirror to see their own faces. Some people even love to look in the mirror from time to time to see whether they keep a good appearance. In this way, mirror becomes their best friend that help them to look confident. On the other hand, some people are afraid of being old. They don't want to see the wrinkles on their face and their hair turning grey. So they don't want to look in the mirror. This actually reflects a negative attitude they hold towards life. In the long term, they might suffer from psychological pressure or some sort of depression, which is actually not a wise act. " Everyone can make themselves look charming at every age stage. If one is confident, one will always look beautiful, it shows that they accept themselves." professor Wu said. Mirror cannot only give confidence to one. By looking in the mirror, one can even find the traces of some diseases from one's own face.
Question: Why does the mirror become the best friend for some people?
Options: (A) Because it brings much confidence to them. (B) Because it makes them more beautiful. (C) Because it tells whether they are clean or not. (D) Because it helps them find their own faults.

Ex Output:
A

Ex Input:
Article: Humans and many other mammals have unusually efficient internal temperature regulating systems that automatically maintain stable core body temperatures in cold winters and warm summers. In addition, people have developed cultural patterns and technologies that help them adjust to extremes of temperature and humidity . In very cold climates, there is a constant danger of developing hypothermia , which is a life threatening drop in core body temperature to below normal levels. The normal temperature for humans is about 37.0degC. However, differences in persons and even the time of day can cause it to be as much as 6degC higher or lower in healthy individuals. It is also normal for core body temperature to be lower in elderly people. Hypothermia begins to occur when the core body temperature drops to 34.4degC. Below 29.4degC, the body cools more rapidly because its natural temperature regulating system usually fails. The rapid decline in core body temperature is likely to result in death. However, there have been rare cases in which people have been saved after their temperatures had dropped to 13.9-15.6degC. This happened in 1999 to a Swedish woman who was trapped under an ice sheet in freezing water for 80 minutes. She was found unconscious, not breathing, and her heart had stopped beating, yet she was eventually saved despite the fact that her temperature had dropped to 13.7degC. In extremely hot climates or as a result of uncontrollable infections, core body temperatures can rise to equally dangerous levels. This is hyperthermia. Life threatening hyperthermia typically starts in humans when their temperatures rise to 40.6-41.7degC. Only a few days at this extraordinarily high temperature level is likely to result in the worsening of internal organs and death.
Question: Why can humans keep stable body temperatures in different seasons?
Options: (A) Because their bodies are unusually efficient. (B) Because they experience different climates. (C) Because they can adjust to cultural patterns and technologies. (D) Because they have internal temperature regulating systems.

Ex Output:
D

Ex Input:
Article: Dear Bewildered, Table manners are about being kind to and considerate of others.Having proper table manners is one way people judge others,and we don't want people to think that we are rude,do we ? Whether in a restaurant or in a home, here are some basic table manners for kids: 1Eat with a fork unless the food is meant to be eaten with fingers.Only babies eat with fingers. 2Sit up and do not hunch over your plate;wrists or forearms can rest on the table,or hands on lap. 3Chew with your mouth closed,No one wants to see food being chewed up.This includes no talking with your mouth full. 4Don't make any rude comments about any food being served.It will hurt someone's feelings.Always say thank you when you're served something. 5Eat slowly.It takes someone a long time to prepare the food,so enjoy it slowly.Wait about 5 seconds after swallowing to get another forkful . 6 Don't reach over someone's plate for something.Politely ask the dish to be passed to you. 7When eating at someone's home or being a guest of someone at a restaurant,always thank the host and tell him or her how much you enjoy it.At least say that you like the dinner ,for example, the dessert is great.
Question: The writer writes this passage mainly for _ .
Options: (A) Foreigners (B) kids (C) Parents (D) teachers

Ex Output:
B