You will be given a definition of a task first, then some input 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.

An attack of the giggles can sometimes appear at the strangest moments. Whether it's during a speech or in a meeting, helpless laughter is one of our most insightful behaviours, according to neuroscientist Sophie Scott. In a recent Ted Talk in Vancouver, Professor Scott revealed that laughter often isn't to do with comedy value, but with our relationships with others. Laughter is often used as a tool for social bonding rather than in reaction to something that has comedy value, according to UCL Professor Sophie Scott. Pictured are Prime Minister David Cameron and US President Barack Obama during a basketball gameProfessor Sophie Scott says laughter often isn't to do with comedy valueIn a conversation, the person who laughs most is usually the one talkingPeople are 30 times more likely to laugh if they are with someone elseIt also triggers brain's mirror region which explains why it is contagious 
 Questions:_ activates the brain's mirror regions that mimic other's actions, and she says this is the reason behind why laughing can be so contagious. (A) Sophie Scott (B) Ted Talk (C) Vancouver (D) Scott (E) Laughter (F) UCL (G) David Cameron (H) US (I) Barack Obama
Output:
(E)