Given the rationale, provide a reasonable question and answer. Step-by-step reasoning process: Classroom is the place of study for students. The student realized that he left his writing instrument at his last place of study in classroom.
 The question and answer:
The student realized that he left his writing instrument at his last place of study, where is it?
Options:
- classroom
- desk drawer
- bathroom
- pocket
- stationery store
The answer is classroom