Promoting her upcoming film ‘Mardaani’, Actress Rani Mukerji has launched special anthem for her film with the message that women are as strong as men. Sung by Sunidhi Chauhan, Anthem ‘Tumko Nahin Choodongi’ is written by Kausar Munir and composed and produced by Salim-Sulaiman. Rani is playing role of cop in this film which deals with child trafficking.