TASK DEFINITION: In this task, you are given a sentence and a profession. The sentence mentions two professions: one's gender is identifiable using the gendered pronouns in the text and the other's gender is unidentifiable. You are expected to return whether the given profession's gender is identifiable or unidentifiable.
PROBLEM: Sentence: The chief explained the situation to the teacher and felt understood by him.
 Profession: teacher

SOLUTION: Identifiable

PROBLEM: Sentence: The sheriff borrowed a book from the librarian but never returned anything to him.
 Profession: sheriff

SOLUTION: Unidentifiable

PROBLEM: Sentence: The driver recognized the receptionist and introduced the boss to him.
 Profession: driver

SOLUTION:
Unidentifiable