Megastar Amitabh Bachchan feels the toughest challenge for an actor today is not dancing, not singing, not versatility, but promoting new films.

"Biggest test for an actor are promotional activities...answering the same questions with same answers, but each sounding different," Amitabh posted on his Twitter page.

After promoting his recently released "Bbuddah...Hoga Tera Baap", the 68-year-old is now busy with "Aarakshan", which is releasing Aug 12, and the forthcoming season of reality game show "Kaun Banega Crorepati 5".