Table: tv_episode_data_115
Columns: no_in_series
title
directed_by
written_by
original_air_date
production_code
u_s_viewers_millions

Question: What is the production code for the number 5 series ? 
SQL: SELECT "production_code" FROM tv_episode_data_115 WHERE "no_in_series" = 5

Question: What is the number  of the series written by Teresa Lin? 
SQL: SELECT COUNT("no_in_series") FROM tv_episode_data_115 WHERE "written_by" = 'Teresa Lin'