A twenty year old female patient comes to the clinic with discoloration of the upper right central incisor. This tooth was intact and otherwise asymptomatic.

Bleaching is indicated in which of the following clinical situations: (A) Dentin discolorations, (B) Teeth with discolored composites, (C) Tooth discoloration due to caries, (D) Teeth with superficial discolorations
Answer is A. None