Definition: In this task, you will be given a short story. One sentence from the story is chosen. Consider the events that happen before that sentence, or are likely to have happened before it. Does any of them directly cause it, or simply make it possible? You should write your answer in the form " A >causes/enables> B". Try to use phrases and sentences from the story to compose your answer when possible.
Input: story: Bob sat there in the chair staring at the tray of sharp tools. The novacane had kicked in and he was drooling fiercely. He wasn't sure what was coming but he just knew it would be awful. In walked the Dentist who looked at the tools and pushed them aside. When he pulled out the chainsaw Bob just fainted.
 selected sentence: The novacane had kicked in and he was drooling fiercely.

Bob takes novacane >Causes/Enables> Bob drools