What is the HDI for 2011 in Tunisia? 
CREATE TABLE table_2155836_1 (hdi__2011_ VARCHAR, country VARCHAR)
SELECT hdi__2011_ FROM table_2155836_1 WHERE country = "Tunisia"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_2155836_1 (hdi__2011_ VARCHAR, country VARCHAR) Question: What is the HDI for 2011 in Tunisia?  [/INST] SELECT hdi__2011_ FROM table_2155836_1 WHERE country = "Tunisia" </s>