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. Williams:  This is Dr. Williams in Communical Disease . You believe you may have a bacterial case ?
Dr. Abrams: Not one , we have _ thirty _ .
Dr. Williams: What ?
Dr. Abrams: I have thirty people in my waiting room right now .
Dr. Williams: What are the symptoms ?

case