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Veteran Bollywood actor Amitabh Bachchan recently wrote a letter that caused quite the stir.

In the letter, he told his granddaughters that the world will try to tell them what to do but they should never worry about 'log kya kahenge'. Some loved the message, others criticised it as a PR stunt for his latest film, Pink. Set in Delhi, the courtroom drama examines the rape culture in India.

Also read: This Amitabh Bachchan fan thinks his letter to his granddaughters is a farce

In a recent interview, Big B admitted that the letter had everything to do with Pink.

"When we were promoting the film, a lot of people were asking the story and concept of Pink, shared Amitabh. "We were getting a little hesitant as to what we should say. That's when [director] Shoojit [Sircar] suggested me to write a summary of the film in a letter and send it to my granddaughters. It will be for all the girls."

Did he think a letter should also be written to boys, Amitabh was also asked.

"I think you are right. This should happen. I always feel that if we need to bring any change in the society, then we need to look after our children from childhood. We should tell them what is wrong and what is right. We all are equal," he said.

In the interview, Amitabh also touched on his desire to change the image of India abroad.

"It's very embarrassing when you visit a foreign country and you see people there talking to you and say, 'Oh you are from India, the land of rape'. It's very embarrassing. I want that to go. I hate it when I go abroad and people say, 'You are from a third world country or you are from a developing country'. Why do they call us that? We all must work towards that and make it (India) a first world country and not a developing, but as a developed country," said the actor.

Shooting Pink was a very emotional experience for Amitabh.

"There were moments when we all broke down. I myself got moved by a particular scene in the film and left the set because I just feel embarrassed to be crying in front of a lady," he added.

Apart from Big B, Pink also features Taapsee Pannu, Kirti Kulhari and Andrea Tariang, Angad Bedi and Piyush Mishra.