human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Flat, Threaded, User-selectable themes, Calendar, Image attachment, Unread message tracking, WYSIWYG Editor
###Question: Which Calendar has a User-selectable themes of user-selectable themes?
gpt
SELECT Calendar FROM table WHERE User-selectable themes = user-selectable themes