Conversation so far:
What did Bose begin Rahul Bose's career doing?
Bose started his acting career on the Mumbai stage in Rahul D'Cunha's Topsy Turvey.
What was Bose's educational background?
CANNOTANSWER.
What was his first performance?
role.
After filming a screen test, Benegal decided to cast him as civil servant Agastya Sen.

Question: When did he get his first big break?
Self-contained rewrite: When did Rahul Bose get his first big break?