The test to determine efficacy of the pasteurization process of milk is–

Correct option is A

• Pasteurization aims to destroy pathogenic microorganisms while inactivating certain heat-sensitive enzymes.
• Alkaline phosphatase is an enzyme naturally present in raw milk that gets completely inactivated at proper pasteurization temperatures.
• If the phosphatase test is negative, pasteurization has been effective; a positive result indicates inadequate heat treatment.
• Polyphenol oxidase and catalase are not standard indicators, and Gerber test is for fat estimation, not pasteurization efficiency.