Question

which is one enzyme that works best in acidic pH only? (present in the human body/consumed by the human body)

Answer 1

present in human body

Answer 2

Stomach acid does not digest protein. Rather, it activates an enzyme calledpepsinogen which then becomespepsin that is secreted by the stomach wall. This enzyme is only active within the pH range of 3.0 to 5.0 and requires the acid to maintain that pH