<prompt> Bluish discoloration of gastric mucosa seen in which poisoning?MercuryCadmiumAmytal sodiumArsenic  <response>: POISONS STOMACH MUCOSA Carbolic acid Leathery mucosa Sulphuric acid Black necrotic stomach mucosa Arsenic Red velvety Mucosa Mercury Slate gray Mucosa HNO3 Yellowish Sodium amytal,Copper sulfate Blue 