Trypsin is an activator of all of the following enzymes EXCEPT: (A) Chymotrypsinogen, (B) Pepsinogen, (C) Proelastase, (D) Procolipase
Answer is B. Actions of trypsin: 

Digestion of proteins
Curdling of milk
Once formed, itself converts trypsinogen into trypsin (autocatalytic action)
Conversion of chymotrypsinogen into chymotrypsin
Polycarboxypeptidses into carboxypeptidase.