What is the stage of winner Carlos Sastre when the general classification was Denis Menchov?
CREATE TABLE table_name_21 (stage VARCHAR, general_classification VARCHAR, winner VARCHAR)
SELECT stage FROM table_name_21 WHERE general_classification = "denis menchov" AND winner = "carlos sastre"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_21 (stage VARCHAR, general_classification VARCHAR, winner VARCHAR) Question: What is the stage of winner Carlos Sastre when the general classification was Denis Menchov? [/INST] SELECT stage FROM table_name_21 WHERE general_classification = "denis menchov" AND winner = "carlos sastre" </s>