What is the production code for the episode with 5.5 million u.s. viewers?
CREATE TABLE table_28195898_1 (production_code VARCHAR, us_viewers__millions_ VARCHAR)
SELECT production_code FROM table_28195898_1 WHERE us_viewers__millions_ = "5.5"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_28195898_1 (production_code VARCHAR, us_viewers__millions_ VARCHAR) Question: What is the production code for the episode with 5.5 million u.s. viewers? [/INST] SELECT production_code FROM table_28195898_1 WHERE us_viewers__millions_ = "5.5" </s>