Detailed Instructions: In this task, you will be presented with a multiple-choice question in Persian, and you should answer the question based on your knowledge. Classify the answers based on options.
Problem:پرجمعیت‌ترین شهر جهان کدام است؟ <sep> (A) تهران (B) توکیو (C) نیویورک (D) پکن
Solution:
B