Definition: 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.
Input: Dr. Joan Watson:  How are you not a total wreck right now ? If my kid was taken and held for ransom , I do n't know if I could keep it together . You seem quite ... I do n't know , Zen .
Rhys Kinlan: I made a delivery once to Holmes at Scotland Yard . Crazy , right ? Crazier still , he invites me to stay and watch him assist in the interrogation of this lunatic who 'd been planting car bombs all over the city . The police knew there was another _ one _ out there , but they did n't know where it was . Holmes is in the room with the guy for , like , five minutes , figures out where the bomb is from a couple of stains on the guy 's shoes . You ask why I 'm not a total wreck ? Because I believe in Sherlock Holmes .

bombs