human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Date, B-52 Model, Serial #, Unit, Bomb Capacity, Mission/Target, Cause of Loss
###Question: When 441st bs, 7th bw is the unit what is the b-52 model?
gpt
SELECT B-52 Model FROM table WHERE Unit = 441st BS, 7th BW