Step 1: Understanding the Concept:
Diagnostic utility of indigenous and microbial enzymes in milk processing.
Step 2: Detailed Explanation:
Matching milk enzymes in List I with functions/indicators in List II:
- A. Lipase (Lipoprotein Lipase): Hydrolyzes milk fat triglycerides into free fatty acids, causing hydrolytic II. Rancidity.
- B. Lactoperoxidase: Activates the natural LP antibacterial system for raw milk preservation, known as IV. Cold pasteurization cold preservation.
- C. $\gamma$-Glutamyl Transpeptidase (GGTP): A membrane-bound enzyme whose thermal inactivation kinetics evaluate the I. Thermal history of milk and high-heat pasteurization verification.
- D. Catalase: Secreted in high amounts by somatic leukocytes, serving as a diagnostic enzyme indicator for III. Subclinical mastitis.
Matching sequence: A-II, B-IV, C-I, D-III.
Step 3: Final Answer:
Thus, the correct matching is A-II, B-IV, C-I, D-III, corresponding to option (B).