Which of the following enzyme digest milk protein in alkaline medium?

Chymotrypsin is a digestive enzyme which uses an active serine residue to perform hydrolysis on the Cterminus of the aromatic amino acids of other proteins. It is a protease enzyme that cleaves on the C-terminal phenylalanine (F), tryptophan (W), and tyrosine (Y) on peptide chains. It shows specificity for aromatic amino acids because of its hydrophobic pocket.