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. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].

The romantic antics of two unassuming five-year-olds are set to become one of the TV moments of the year as they provide a dose of unmissable entertainment. Arthur and Sienna steal the show in tonight’s episode of Channel 4’s hit fly-on-the-wall documentary series, The Secret Life Of 4, 5 And 6 Year Olds, as they tentatively negotiate their first kiss. The Big Brother for little people brings together a group of children from very different backgrounds, and places them in a room full of hidden cameras. During the priceless TV moment, Arthur tells his little friend: ‘We need to do a kiss on the lips to get married.'The Secret Life Of 5 Year Olds captures children on hidden cameraRomance blossoms between Arthur and Sienna in the playhouseArthur tells Sienna: 'You have to do a kiss on the lips to get married'Alfie and Emily also fall into each other's arms in a flurry of 'I love you's' 
 Question:But intrigued by her new game, _ tries her best to recapture the moment.
Output:
Sienna