human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: Song, Singer, Co-Singers, Music Director, Lyricist, Co-Stars, Movie/Album, Year, Additional Info
###Question: How many co-singers were there when Parveen Babi co-starred?
gpt
SELECT COUNT Co-Singers FROM table WHERE Co-Stars = Parveen Babi