In this task, you will be presented with a question in Persian. Based on the knowledge you need to answer the question, classify the question into "math_and_logic", "literature", or "common_knowledge".
Q: بنيادي ترين عامل پيدايش شهرها و رونق زندگي اجتماعي در گذشته چه چيزي بوده است؟
A: 
common_knowledge