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: Megan Hunt:  Cause of death is still drug overdose
Curtis Brumfield: Actually , I just got the tox screen results . No drug were detected in Rebecca 's system
Tommy Sullivan: So , what killed her now , Dr. Hunt ?
Megan Hunt: There 's still a scientific explanation
Ethan Gross: Yeah , I really , really want there to be _ one _ !

explanation