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) A young Russian alleged to have masterminded a massive hacking of social networks including LinkedIn and Dropbox is now at the center of an extradition struggle between the United States and Russia. Yevgeniy Nikulin was detained in October 2016, in the Czech Republic capital of Prague, after US authorities issued an international arrest warrant for him. He was on vacation there with his girlfriend. A grand jury indictment filed in 2016 in California charges him with computer intrusion and aggravated identity theft, among other offenses. Nikulin denies all the charges. If convicted of all charges, he could face a maximum sentence of more than 50 years in prison and more than $2 million in fines.Yevgeniy Nikulin sits in a Czech prison as the US and Russia both seek to extradite himThe alleged computer hacker appeared to enjoy a lavish lifestyle before his arrest 
 Questions:The Nikulin case is yet another strain on _-Russian relations. (A) Russian (B) LinkedIn (C) Dropbox (D) United States (E) Russia (F) Yevgeniy Nikulin (G) Czech Republic (H) Prague (I) California (J) Nikulin (K) Czech
Solution:
(D)