human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Stage, Winner, General Classification, Youth Classification, Mountains Classification, Sprint Classification, Most Courageous, Team Classification
###Question: Who won the mountains classification when Maarten Tjallingii won most corageous?
gpt
SELECT Mountains Classification FROM table WHERE Most Courageous = Maarten Tjallingii