50.
A:
Acidic pH optima of proteolytic enzymes and production of pancreatic trypsin inhibitor
B:
Alkaline pH optima of proteolytic enzymes and production of pancreatic trypsin inhibitor
C:
Zymogen synthesis of proteolytic enzymes and production of pancreatic trypsin inhibitor
D:
Maintenance of isotonicity and and production of pancreatic trypsin inhibitor
The answer is: C