You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Among the entities, try to find the best entity that is most likely to fill in "_" and classify the answers based on options.

For four years we have waited expectantly for the pitter patter of tiny paws. Soon, that wait could finally be over. Tian Tian, the UK's only female giant panda, has conceived and could give birth to a cub as early as August. However Edinburgh Zoo, where the pandas live, have warned people 'not to get too excited' as the process is 'extremely complex'. Moreover, on the two previous occasions keepers inseminated Tian Tian - whose name means 'Sweetie' - she has failed to produce a panda cub. She was artificially inseminated again in March this year, but keepers at the zoo say implantation - when a fertilised egg attaches to the uterus - has not yet occurred.Tian Tian has conceived and could give birth to a cub as early as AugustShe has been inseminated twice before but so far failed to produce a cubTian Tian and Yang Guang arrived in 2011 from China to great fanfareOn loan at £600k a year, became first giant pandas to live in UK for 17 years 
 Questions:Under the terms of the agreement any cubs will return to _ at the age of two, the age at which they would normally leave their mother in the wild. (A) Tian Tian (B) UK (C) Edinburgh Zoo (D) Sweetie (E) Yang Guang (F) China
Solution: (F)
Why? This is a good example. Based on the passage, any cubs will return to China at the age of two

New input: (CNN) In October 2007, the Gallup polling organization wrote that, "Gallup's 2007 national presidential polling strongly points to [Hillary] Clinton winning the 2008 Democratic nomination. Barring something unusual or otherwise unexpected, she is well positioned for the 2008 Democratic primaries." Gallup was wrong. In June 2008, it wrote, "After winning one of the most competitive nomination battles in U.S. history, Barack Obama faces what looks to be an equally tough general election for the presidency." Gallup's polling had Obama and John McCain neck and neck, with McCain leading by a marginal point. In November 2008, Barack Obama was elected president, winning 52.9% of the popular vote to McCain's 45.7%.Sally Kohn: Polls that show Trump closing gap with Clinton alarm some on left, encourage Sanders and supportersNot so fast, she says. Polls at this stage called it wrong about Obama, McCain, Clinton in earlier racesKohn: It's early in horse race; Sanders has right to stay in race 'til California, possibly convention, but should change tone 
 Questions:If Clinton beats _, it will cement her position as the likely nominee. (A) CNN (B) Gallup (C) Hillary (D) Clinton (E) Democratic (F) U.S. (G) Barack Obama (H) Obama (I) John McCain (J) McCain (K) Sally Kohn (L) Trump (M) Sanders (N) Kohn (O) California
Solution:
(M)