Well .... I am sorry to tell ya this but..... I don’t know what your culture is. Just talk about the art, language, educational system, nationalism, food, clothings, music, writing, ideologies and beliefs.
That would be like your...height, skin color and eye color ect...
The answer is Stomach
this digestive acid is usually called gastric acids.The gastric acids in our body is powerful enough to destroy a metal.
This process is happening before the digested foods enter the small intestine