Accuracy of Protease Statements Steps:

• Evaluate statement 1: Secreted bacterial proteins, including proteases, are foreign antigens that trigger antibody production in hosts.
• Evaluate statement 2: Protease action is hydrolysis, where water molecules add across peptide bonds to break them.
• Evaluate statement 3: Protease pH optima vary (e.g., pepsin at pH 2, trypsin at pH 8), so pH 2 is not universal.
• Select option matching correct statements: 1 and 2 only.

Why B is correct:

• B identifies statements 1 and 2 as true based on immunological and biochemical definitions of antigens and hydrolysis.

Why the others are wrong:

• A includes incorrect statement 3, overgeneralizing pH optimum.
• C omits correct statements 1 and 2.
• D selects only false statement 3.

Final answer: B