human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Call sign, Frequency MHz, City of license, ERP W, Class, FCC info
###Question: What is the class of the translator with 10 ERP W and a call sign of w273bl?
gpt
SELECT Class FROM table WHERE ERP W = 10 AND Call sign = w273bl