New Delhi: Megastar Amitabh Bachchan on Wednesday announced that he has pledged to donate his organs.Taking to Twitter, Amitabh shared a picture of him with a green ribbon on his coat, and said, “T 3675 – I am a pledged ORGAN DONOR .. I wear the green ribbon of its sanctity!!””T 3674/5 – … in fulfilment of ancestors .. in the remembrance of them that lived in time , to give us this today .. honour for them done. The veteran actor had said on Tuesday.The 77-year-old actor is currently shooting for the KBC season 12.