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.

Example input: 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
Example output: (F)
Example explanation: This is a good example. Based on the passage, any cubs will return to China at the age of two
Q: (CNN) -- How were inmates inside a Texas prison allegedly able to make cell phone calls, plot crimes and acquire drugs? With the help of 17 former corrections officers who once worked at the prison, according to a federal grand jury indictment unsealed this week. Now the former officers and 12 others have been arrested and charged with racketeering after a four-year investigation authorities dubbed Operation Prison Cell. The former guards are accused of involvement in a smuggling scheme that undermined the justice system, U.S. Attorney Kenneth Magidson told reporters Wednesday. "Prison is a place where inmates are supposed to do their time," he said, "not where they do their crime."Former prison guards are charged with racketeering for allegedly smuggling cell phonesOfficials say prison inmates used the phones to plot serious crimes, including killingsThe arrests of 17 former corrections officers were part of Operation Prison Cell 
 Questions:In the _, authorities said Wednesday that rampant corruption had festered since 2005. (A) CNN (B) Texas (C) Operation Prison Cell (D) U.S. (E) Kenneth Magidson (F) Prison
A:
(F)