The serine proteases are all except: (A) Elastase, (B) Chymotrypsin, (C) Trypsin, (D) Pepsin
Answer is D. They are enzymes with a serine residue at the active site and most of the proteolytic enzymes belong to this group, e.g. trypsin, chymotrypsin, clotting factors. Ref: DM Vasudevan, page no: 44