SCHEMA:
CREATE TABLE table_name_83 (national_final_main_host VARCHAR, semi_final_heat_host VARCHAR, year_s_ VARCHAR)
USER:
What is the name of the national final main host when the semi final/heat host shows internal selection in 2011?

QUERY:
SELECT national_final_main_host FROM table_name_83 WHERE semi_final_heat_host = "internal selection" AND year_s_ = "2011"