Given a question and a context passage, generate the answer having the word or phrase from the context passage. Here, the answer should be a shortest continous span from the passage.
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Question: Context: Modeled after US hot website.com, group buying websites are now popular in China. These websites use the power of group buying to get competitive discounts for a daily deal on some best stuff to do, see, eat and buy in the cities across China. Discounts are available within just one click. Zhao lei, a software engineer in Beijing, loves the one-hour lunch break at noon,as it is the best time for him to check "today's special" at his favorite group buying websites . Sometimes he searches for great deals at directory sites devoted to the new shopping space. Zhao spends around 800 yuan($117.65) on group buying every month, mostly to buy food coupons for eating at some nice restaurants and occasionally to find something fun to do. " I love group buying. In addition to the competitive discounts it offers, it helps me get something fun, exciting and new, and such surprises give me a reason to try something new," he said. When he finds a really good bargain, he will send the link to friends or colleagues through MSN,QQ, or e-mail, or share the information at some social networking websites. In doing so, he often gets a certain cut off the price. At some sites, buyers are invited to leave notes about what they want to buy and the website will consider it if similar applications reach a certain number. That is how Zuo got her digital camera after waiting for two months. "It is cool. I want to buy a new digitgal camera for my trip to Switzerland this winter, but I never expected such cheap prices!" Zuo said. 
 Question: What is the passage mainly about?

Answer: group buying


Question: Context: Survivors of acute respiratory failure commonly experience long-term psychological sequelae and impaired quality of life. For researchers interested in general mental health, using multiple condition-specific instruments may be unnecessary and inefficient when using the Medical Outcomes Study Short Form (SF)-36, a recommended outcome measure, may suffice. However, relationships between the SF-36 scores and commonly used measures of psychological symptoms in acute survivors of respiratory failure are unknown. Our objective is to examine the relationship of the SF-36 mental health domain (MH) and mental health component summary (MCS) scores with symptoms of depression, anxiety, and post-traumatic stress disorder (PTSD) evaluated using validated psychological instruments. We conducted a cross-sectional analysis of 1,229 participants at 6- and 12-month follow-up assessment using data from five studies from the United States, the United Kingdom, and Australia. Symptoms were assessed using the Hospital Anxiety and Depression Scale (HADS), Depression Anxiety Stress Scales, the Davidson Trauma Scale, Impact of Event Scale (IES), and IES-Revised (IES-R). At 6-month assessment there were moderate to strong correlations of the SF-36 MH scores with HADS depression and anxiety symptoms (r=-0.74 and -0.79) and with IES-R PTSD symptoms (r=-0.60) in the pooled analyses. Using the normalized population mean of 50 on the SF-36 MH domain score as a cut-off, positive predictive values were 16 and 55% for substantial depression; 20 and 68% for substantial anxiety (Depression Anxiety Stress Scales and HADS, respectively); and 40, 44, and 67% for substantial PTSD symptoms (IES-R, IES, and Davidson Trauma Scale, respectively). Negative predictive values were high. The area under the receiver operating characteristics curve of the SF-36 MH score was high for depression, anxiety, and PTSD symptoms (0.88, 0.91, and 0.84, respectively). All results were consistent for the MCS, across the individual studies, and for the 12-month assessment. For researchers interested in general mental health status, the SF-36 MH or MCS offers a strong measure of psychological symptoms prevalent among survivors of acute respiratory failure. For researchers interested in specific conditions, validated psychological instruments should be considered. 
 Question: Symptoms of which disorder are evaluated with the Davidson Trauma Scale?

Answer: ptsd


Question: Context: Brian Cohen is born in a stable next door to the one in which Jesus is born, which initially confuses the three wise men who come to praise the future King of the Jews. Brian grows up an idealistic young man who resents the continuing Roman occupation of Judea. While attending Jesus' Sermon on the Mount, Brian becomes infatuated with an attractive young rebel, Judith. His desire for her and hatred for the Romans lead him to join the "People's Front of Judea", one of many fractious and bickering independence movements, who spend more time fighting each other than the Romans. After several misadventures, and escaping from Pontius Pilate, Brian winds up in a line-up of would-be mystics and prophets who harangue the passing crowd in a plaza. Forced to come up with something plausible in order to blend in and keep the guards off his back, Brian repeats some of what he had heard Jesus say, and quickly attracts a small but intrigued audience. Once the guards have left, Brian tries to put the episode behind him, but he has unintentionally inspired a movement. He grows frantic when he finds that some people have started to follow him around, with even the slightest unusual occurrence being hailed as a miracle. Each of their responses ever growing in fervor and intensity making it harder and harder for him to get away from them. Yet because of the mob's excitement, they end up leaving Brian alone. After which he sees Judith is one who didn't leave, and they then spend the night together. In the morning, Brian, completely naked, opens the curtains to discover an enormous crowd outside his mother's house who proclaim him to be the Messiah. Brian's mother protests, "He's not the Messiah, he's a very naughty boy."; and, "There's no Messiah in here. There's a mess all right, but no Messiah." Yet all of her attempts at dispersing the crowd are rebuffed. Furthermore, once Brian addresses them, he also finds that he is unable to change their minds. His followers are completely committed to their beliefs in and of Brian's divinity. They immediately seize upon everything he says and does as points of doctrine. The hapless Brian finds no solace as people have even mobbed his mother's house. They fling their afflicted bodies at him demanding miracle cures and divine secrets. After sneaking out the back, Brian is then finally captured and scheduled to be crucified. Meanwhile, a huge crowd has assembled outside the palace. Pilate (together with the visiting Biggus Dickus) tries to quell the feeling of revolution by granting them the choice of one person to be pardoned. The crowd, however, shouts out names containing the letter "r", mocking Pilate's rhotacistic speech impediment. Eventually, Judith appears in the crowd and calls for the release of Brian, which the crowd echoes since the name also contains an "r". Pilate agrees to "welease Bwian". His order is eventually relayed to the guards, but in a scene that parodies the climax of the film Spartacus, various crucified people all claim to be "Brian of Nazareth" and the wrong man is released. Various other opportunities for a reprieve for Brian are denied as, one by one, his "allies" (including Judith and his mother) step forward to explain why they are leaving the "noble freedom fighter" hanging in the hot sun. Hope is renewed when a crack suicide squad from the "Judean People's Front" (not to be confused with the People's Front of Judea) come charging towards the Romans, but rather than fighting to release Brian or the other prisoners, they commit mass suicide as a political protest. Condemned to a long and painful death, Brian finds his spirits lifted by his fellow sufferers, who break into song with "Always Look on the Bright Side of Life."[6] 
 Question: Who orders Brian's release ?

Answer:
pilate