Congress leader Pawan Khera on Sunday called for a fast-track inquiry into the alleged use of 'animal fat' prasadam for Sri Venkateshwara Swamy Temple in Tirupati. "It is very surprising that the Tirumala Tirupati Devasthanams (TTD) Executive Officer, appointed by Chandrababu Naidu's government, contradicts the claims of adulteration in the prasadam.