human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: D 49, D 48, D 47, D 46, D 45, D 44, D 43, D 42, D 41, D 40
###Question: I want the D 47 for D 41 being r 21
gpt
SELECT D 47 FROM table WHERE D 41 = r 21