human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: No. in series, Title, Directed by, Written by, Original air date, U.S. viewers (in millions)
###Question: What is the title when 2.50 is u.s. viewers (in millions)? 
gpt
SELECT Title FROM table WHERE U.S. viewers (in millions) = 2.50