I protect the walls of stomach from the action of acid . Who am I ?

The hydrochloric acid secreted by the gastric glands activates the enzyme _____i_____ while the _____ii_____secreted by gastric glands protects the lining of the stomach from the action of acid.

The inner lining of the stomach secretes_i___ t hat protects the lining of the stomach from the action of . _______ii____ The information in which alternative completes the given statement?

I am cooked on steam. Who am I?