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 collects old model cars as a hobby. He told me he doesn't have a favorite but I'm not sure that's true. Yesterday I heard him talking with his friend on the phone about cars. Bob told his friend that a 57 Chevy was his favorite car. I wonder why Bob didn't want to tell me that.
 selected sentence: Bob told his friend that a 57 Chevy was his favorite car.

Bob's friend calls him >Causes/Enables> Bob talks to his friend