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.
One example: Article: Homework can put you in a bad mood , and that might actually be a good thing. Researchers from the University of Plymouth in England doubted whether mood might affect the way kids learn. To find out the answer, they did two experiments with children. The first experiment tested 30 kids. Someshapes were hidden inside a different, larger picture. The kids had to find the small shapes while sitting in a room with either cheerful or sad music playing in the background. To test their mood, the scientists asked the kids to point to one of five faces, from happy to sad. Children who listened to cheerful music tended to point to the smiley faces while the others pointed to the unhappy ones. The researchers found that sad kids took at least a second less to find the small shapes. They also found an average of three or four more shapes. In the second experiment, 61 children watched one of two scenes from a film. One scene was happy, and the other was sad. Just like in the first experiment, kids who saw the sad scene acted better compared to the others. The researchers guessed that feeling down makes people more likely to focus on a problem or difficult situation. Not all scientists agree with them, however. Other studies argued that maybe, that cheerful music in the first experiment distracted kids from finding shapes. While scientists work on finding out the answers, it still might be wise to choose when to do your tasks according to your mood. After eating a delicious ice cream, for example, write an essay. 
 Question: Researchers did experiments on kids in order to find out _ . 
 Options: (A) how they really feel when they are learning (B) whether mood affects their learning ability (C) what methods are easy for kids to learn (D) the relationship between sadness and happiness
Solution is here: B
Explanation: It is clearly mentioned in the article that to the check effect of mood on children is the main purpose of the experiment. So, B is the correct answer.

Now, solve this: Article: While most travelers aim to stay out of the hospital while on vacation, a growing number of medical tourists-people who combine treatment with travel - are crossing international borders for the purpose of getting medical services, which can range from a hip replacement to a tummy tuck. Widespread air travel, increasing healthcare costs in developed countries, long waiting lists and an ageing world population have all contributed to a global increase in medical tourism in the past decade. And Asia takes the lead in terms of world market share. More than 89% of medical tourists travelled to Thailand, India or Singapore in 2010, with Bangkok and Singapore leading the pack. But the cost of hotel rooms and treatment are both far more expensive in Singapore than in the Thai capital, making Bangkok the most popular place for medical tourism in the world. Even after the serious floods of 2011, 19 million tourists visited Thailand in 2011, a 20% jump from 2010, with about 500,000 tourists travelling specifically for medical treatment. Given Thailand's reputation for outstanding service, it is not hard to see why Bangkok has quickly become the medical tourism centre of Asia. The Tourism Authority of Thailand(TAT), which began medical tourism in 2004, has a detailed medical tourism website that lists many of the most popular treatments available, including dental work, dermatology and cosmetic surgery, as well as listing reputed hospitals, making it easy for potential visitors to decide on a procedure. TAT has also recently partnered with Krungthai Bank, the national bank of Thailand, to offer tourists a card called the Miracle Thailand Card, which offers some medical and life insurance coverage in case of an accident. "The hospitals in Bangkok are some of the highest quality in the world,meeting US standards,"said Steven Lash, CEO of a US-based medical travel company that sends tourists to Bangkok as well as to seven other countries, including Turkey and Mexico. "All of the tourists we have sent to these hospitals have given us excellent feedback   on their procedures and their experiences at the hospitals." 
 Question: Medical tourism is so popular nowadays partly because  _  . 
 Options: (A) aged patients prefer to travel (B) air travel is cheaper than before (C) local hospitals lack advanced equipment (D) medical treatment is expensive in some countries
Solution:
D