instruction:
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.
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.
answer:
D

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Article: Language is always changing. In a society where life continues year after year with few changes, the language does not change either. The earliest known languages had difficult grammar but a small, limited vocabulary. Over the century, the grammar changed, and the vocabulary grew. For example, the English and Spanish people who came to America during the sixteenth century gave names to all the new plants and animals they found. In this way, hundreds of new words were introduced into English and Spanish vocabularies. Today life is changing very fast, and language is changing fast too. There are several major language families in the world. Some scientists say there are nine main families, but other scientists divide them differently. The languages in each family are connected, and scientists think that they came from the same parent language. About 3 percent of the people in the world speak languages that are not in these major families.
Question: The early language had _ .
Options: (A) a lot of problems (B) words and easy grammar (C) words but no grammar (D) grammar but not many words
answer:
D

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Article: Most people have some common sense. When we see something suspicious on TV, in the newspaper, or on the Internet, we roll our eyes and wonder how anyone could believe something so stupid. Nevertheless, there are stories that even educated people still believe. These tales may or may not be true, but they leave us wondering whether they are real or not. On National Geographic Channel, these stories are dissected in full detail in the series Is It Real. Thousands of years ago, aliens landed on the Earth. They tampered with the evolution of humans and the results of this can be seen practically everywhere. Sound ridiculous? Not to some people. Believe it or not, there are those who believe that alien astronauts had a hand in making the human race what it is today. Travel back in time with Ancient Astronauts and visit our "alien ancestors". In the autumn of 1888, Jack the Ripper roamed the streets of London's East End. After his reign of terror was over, five women had been killed. To this day, the mystery of who killed these ladies remains unsolved. No one knows for sure, but the truth may be revealed on Jack the Ripper. Vampires . Just the thought of these fictional beasts is enough to make your blood run cold. While we may think that they only come to life in books and movies, vampires are actually based on real people. Historians, folklorists, scientists and doctors all work together to investigate the plausibility of vampires. Take a bite into this juicy mystery on Vampires. No other channel can offer this type of programming other than National Geographic Channel. In this unique series, they've stripped away 12 myths that have stood the test of time to expose the truth and find out the answer to the question--Is it real?
Question: What type of person would believe these stories?
Options: (A) Those with a fear of ghosts. (B) Those without any common sense (C) Those including the educated (D) Only educated people.
answer:
C