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.

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.
D

Article: 'Student Voice' is a student-run education conference discussing education in the 21st century. This event aims to gather the views and opinions of students not only in Victoria and Australia, but around the globe. On Sunday 29 July 2012 students will discuss a series of questions regarding the role of education in the 21st century. By the end of the day they will hopefully have comprehensive answers to be shared with schools around the state and maybe even the world. Students from Preshill would like to invite a group of 5-10 students from your school to participate in this free forum . The event is being held on Sunday 29 July 2012 from 10am-2.30pm at the Hawthorn Town Hall, 360 Burwood Rd, Hawthorn. They are inviting students who are enthusiastic on any of our topics of discussion to present a keynote speech on the day. If you can't make the day, they welcome your written or recorded thoughts on our questions, which will be on display at the event. The topics for discussion: Key Question: What is the ideal 21st century education? 1. Is it a school's place to teach ethics, values, morals, confidence, self-esteem? 2. What are the effects of a uniform national curriculum ? 3. How can we make education more engaging? 4. Should students be compared and ranked against each other? 5. What is the place of social networking and new media technology in education? 6. What is the best way to determine student knowledge? Visit their Facebook page (see below) for updates, to communicate with organizers and other participants, and to indicate your interest in making a keynote speech.
Question: What is the aim of the Student Voice Conference?
Options: (A) To gather students' ideas about education and share these ideas with schools. (B) To discuss the ideal 21 (C) To invite some students to participate in a free forum about education. (D) To create a chance for students to communicate with each other.
A

Article: Vending machines are found in 16% of U.S.elementary schools, 52% of middle schools and 88% of high schools.About 22% of students in grades 1 through 12 buy food in vending machines each day--and those purchases added an average of 253 calories to their diets, according to a new study in the September issue of the Journal of School Health. Just to be clear, those were not 253 calories' worth of tofu, yogurt or carrot.The most popular vending machine items included soft drinks, candy, chips, crackers, cookies, cakes and ice cream.On the plus side , kids also bought low-fat milk, fruit juice and even fruit, the study found. But the eventual effect on kids' diets was not good.Those who bought from vending machines ate an average of 156 grams of sugar per day, compared with 146 grams for those who abstained .They also consumed less fiber, iron and vitamin B. _ Vending machine customers ate 4% less sodium than other students--an average of 3,287 milligrams per day compared with 3,436 mg for those who didn't buy from vending machines.That's probably because the extra snacks made kids too full to eat as much at mealtimes, when dishes are especially Salty.In any event, kids should eat no more than 1,200 to 1,500 mg of sodium each day, according to the Mayo Clinic.Even for adults, the government recommends a daily limit of 2,300 mg. Overall, vending machines in school appear to be a threat to children's health.The researchers calculated that all that snacking adds up to about14 extra pounds per child per school year.For some students this might be a serious contributor to weight issues.The study was based on data collected from 2,309 children nationwide for the third School Nutrition Dietary Assessment Study, which was conducted by the U.S.Department of Agriculture's Food and Nutrition Service.
Question: The students using vending machines take in less of all the following EXCEPT .
Options: (A) sugar (B) fiber (C) vitamin (D) iron
A