human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Rider, Manufacturer, Laps, Time/Retired, Grid
###Question: What is the time/retired for the rider with the manufacturuer yamaha, grod of 1 and 21 total laps?
gpt
SELECT Time/Retired FROM table WHERE Laps = 21 AND Manufacturer = yamaha AND Grid = 1