Big B becomes Rana`s Hindi tutor! Megastar Amitabh Bachchan, who is extremely fluent in spoken and written Hindi, offered to help southern actor Rana Daggubati with the language during the shooting of `Department`. Initially, Big B was unaware of Rana`s weakness in the language. But later when he got to know about it, he decided to pull the young actor`s leg. According to a source, the 69-year-old veteran asked Rana to narrate tough Hindi words...