I'll give you a question, please answer with step-by-step reasoning process. If a coworker needed a pen they might ask you for one, that's why you should keep spares in your leather what?\nOptions:\n- pocket\n- jacket\n- friend's house\n- desk drawer\n- briefcase

User
Pen is a basic office supply. People carry basic office supplies in their office bag. Leather briefcase is the most common office bag. People keep extra pens in their leather briefcase.
The answer: briefcase.
Assistant