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: Former porn star Bree Olson says ex-lover Charlie Sheen must 'face the consequences' for exposing her and so many others to the potentially deadly HIV virus. Sheen, 50, claimed he was diagnosed with the virus four years ago in a TV interview last week but former lover Olson believes he knew about it when they lived together in 2011 - yet never told her. Now she has accused him of 'putting a loaded gun to my head' by exposing her to the disease, and said doing so without telling someone is a crime in the US so he should be brought to justice.Sheen, 50, admitted last week he was diagnosed with HIV four years agoFormer girlfriend star Bree Olson says he never told her about itShe and another girl lived with him in 2011 and said they had sex every dayExposing others to HIV is a crime in America and she says he must 'face consequences' 
 Questions:It is also a misdemeanor to willfully expose someone to _, though that carries a prison sentence of just a few months. (A) Bree Olson (B) Charlie Sheen (C) HIV (D) Sheen (E) Olson (F) US (G) America
Solution:
(C)