Answer: Pepsin is an enzyme which is very specific to temperature and pH for its working.
Step-by-step explanation:
The pepsin is an enzyme which is found in the stomach and works best at pH which ranges between 0.5-2.5. This the pH that matches the pH of the stomach so that it works he best.
In case the pH is below this or above this the enzyme gets denatured as it is proteinous in nature. The denatured enzymes is inactive in nature and will not work on the protein.
Hence, the enzymes are very specific to the temperature and pH for its working.