Step 1: Enzymes that work in acidic conditions are primarily those involved in digestion, such as pepsin and rennin.
- Pepsin is an enzyme in the stomach that works best in acidic environments to break down proteins.
- Rennin, also called chymosin, is an enzyme found in the stomach of young mammals and aids in curdling milk, which also occurs in an acidic environment.
Thus, the correct match is Rennin and pepsin (Option C).