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.

Ex Input:
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?

Ex Output:
group buying


Ex Input:
Context: Moscow Sheremetyevo International Airport If You've Lost Personal Belongings *On Board --Contact the airline's representatives *At the Airport --Contact: --Sheremetyevo Police Department ......+7(495)578-22-55 --Unclaimed luggage storage room in Terminal C ......+7(495)578-23-26 --Unclaimed luggage storage room in Terminal D ......+7(499)500-65-52(domestic flights) ......+7(495)753-86-41(international flights) When collecting Lost and Found items, you shall have an identification document, a boarding pass or a ticket, and also indicate the place where the items were lost and prove they are yours. If Your Luggage Is Lost or Damaged Before leaving the arrival area, please turn to the Lost and Found counter to file a report. The written claim shall be submitted to the airline company not later than seven days from the time when the luggage was to be collected. If your luggage is not found within twenty-one days of the time when the claim was filed, you have the right to claim damages in the amount of not more than 600 rubles per kilogram. Amount refunded for the hand luggage lost through the fault of an airline is not more than 11, 000 rubles regardless of its weight. Amount refunded for damaged luggage is calculated based on the same tariffs . Keep your flight documents (a ticket, boarding pass, luggage tag, and delayed luggage report filed at the airport) until the end of the procedure for searching for your luggage. Current information on luggage-tracing results ......+7(495)578-76-65 Lost and Found service of Aeroflot Russian Airlines ......+7(495)544-33-25(from 9:00- 20:00) +7(495)753-86-41(24 hours) For further information please contact the airline. 
 Question: Which number will you probably dial to see whether your lost luggage has been found?

Ex Output:
7(495)578-76-65


Ex Input:
Context: Since the initial approval of imatinib much has been learned about its resistance mechanisms, and efforts have continued to improve upon BCR-ABL tyrosine kinase inhibitor therapy. Targeted therapy with TKIs has continued to be an area of active research and development in the care of acute and chronic leukemia patients. This article reviews current approved and investigational TKI treatments for chronic myelogenous leukemia (CML), Philadelphia-chromosome positive acute lymphoblastic leukemia (Ph + ALL) and acute myelogenous leukemia (AML). There are now more potent BCR-ABL TKIs approved, which allow for additional options when determining front-line and second-line CML and Ph + ALL treatments. The T315I mutation is an ever-present challenge. Ponatinib, a pan BCR-ABL TKI, while still under investigation, is very hopeful with its ability to overcome T315I mutations in resistant CML and Ph + ALL patients. Because nilotinib and dasatinib have not been directly compared, at present we recommend selecting one or the other based on the side-effect profile, drug interactions, patient comorbidities, and mutational status. FLT-3 inhibition is of particular interest in AML patients with FLT-3 internal tandem duplication mutations; this type of targeted therapy continues to be studied. 
 Question: What tyrosine kinase, involved in a Philadelphia- chromosome positive chronic myelogenous leukemia, is the target of Imatinib (Gleevec)?

Ex Output:

bcr-abl