In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.

[Q]: Michael Westen:  Creating an explosive device in the field requires a strong knowledge of chemistry and the ability to improvise with whatever equipment happens to be lying around ... An old fire extinguisher makes an ideal compression chamber . Add some metal shavings and the right cleaning supplies , and you can serve up a bomb that can blast through a cinderblock wall .
Fiona Glenanne: Why is it you can never find a good sodium hydroxide solution when you need _ one _ ?
[A]: solution


[Q]: Special Agent Rachel McCord:  I was following up on Valkyrie to see if there was anything more to the story . This is a family photo we got from Rasheed . He identified this woman as the servant whose body Bronson took after the air strike . And we 've identified her as Farrah Usman .
Matt Hendricks: Yeah , she 's listed as a civilian contractor working out of the U.S. Consulate in Kabul .
Special Agent Rachel McCord: It 's a typical cover for an intelligence operative .
Matt Hendricks: Yeah , and she was supposedly killed by a roadside IED the same night as the Zawari attack .
Chief Carl Villante: Well , that makes sense . The injuries from an IED look a lot like those from an air strike .
Special Agent Rachel McCord: That 's not the story . Look at this . So , Farrah Usman 's body was shipped back to Dover two days later . It was claimed by this man . Recognize that name ?
Kate Beckett: Brad Parker ? The reporter ?
Special Agent Rachel McCord: _ One _ and the same .
Kate Beckett: I do n't get it . How is he connected to Valkyrie ?
Special Agent Rachel McCord: According to the paperwork , he was her fiancé . He 's involved in this whole thing .
[A]: Parker


[Q]: Richard Castle:  Legend tells of a mysterious video that can harness the forces of evil from the beyond . The disc is a harbinger of grave misfortune , marking its watchers to certain and unavoidable death . I saw it , just like Val did . That 's why she said " it 's coming for me " . That 's how she knew when she was going to die . Why she was trying to ward off spirits . Because of the message on that disc .
Javier Esposito: How 's a DVD going to kill you ? Is it going to come at you like a ninja star ? Cut your head off ?
Richard Castle: The actual DVD will not kill me , Esposito . It will be the spirit inside the DVD . Just like in The Ring .
Kevin Ryan: Ooh , ooh , the _ one _ with the creepy , waterlogged little girl that crawls out of the TV . I did n't sleep for days after that movie .
[A]:
movie