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) San Diego police are trying to identify a suspect in a series of grisly attacks on the California city's homeless population. Two homeless men have been killed -- one set on fire, the other beaten to death -- and two others were hospitalized with serious injuries, one who was beaten and the other set afire. The first three attacks occurred in 25 hours from early Sunday to Monday. The fourth happened around 5 a.m. Wednesday, when authorities found a man ablaze on the ground across from the federal courthouse downtown. That victim, a 23-year-old man, was taken to a hospital and is expected to survive, Capt. David Nisleit said Wednesday. A 61-year-old man who was beaten is also expected to survive, he said.Police want to talk to a man seen in a convenience store surveillance videoTwo victims have been set on fire, two others beaten, police say 
 Questions:_ and other city officials said the homeless killings and attacks are a priority for the entire department. (A) CNN (B) San Diego (C) California (D) David Nisleit
Solution:
(D)