**Question:** True about Pasteurization of milk is all except-

A. Reduces bacterial counts in milk
B. Changes the flavor and aroma of milk
C. Increases the shelf life of milk
D. Involves the use of antibiotics

**Core Concept:** Pasteurization is a process of heat treatment of milk to reduce the number of pathogens and enhance the shelf life of milk. It was first introduced by Louis Pasteur to prevent milk-borne diseases like anthrax and brucellosis.

**Why the Correct Answer is Right:** Pasteurization achieves its effects through the following mechanisms:

* Reduces bacterial counts in milk: By heating the milk to a specific temperature and duration, the majority of harmful microorganisms are killed, thus reducing the risk of foodborne illnesses.
* Changes the flavor and aroma of milk: The pasteurization process involves heating the milk which can alter the chemical composition and structure of milk proteins, leading to changes in the flavor and aroma.
* Increases the shelf life of milk: Due to the reduced bacterial counts and altered chemical composition, pasteurized milk has a longer shelf life than raw milk.

**Why Each Wrong Option is Incorrect:**

**Option A:** Antibiotics are used to treat bacterial infections and are not involved in the pasteurization process. Antibiotics are not part of pasteurization as they are not used to alter the chemical composition of milk.

**Option B:** Antibiotics are used to treat bacterial infections and are not involved in the pasteurization process. Antibiotics are not used to alter the flavor and aroma of milk; this is a result of the pasteurization process itself.

**Option C:** Antibiotics are used to treat bacterial infections and are not involved in the pasteurization process. Antibiotics are not used to increase the shelf life of milk; pasteurization does this through the heating process.

**Option D:** Antibiotics are used to treat bacterial infections and are not involved in the pasteurization process. Antibiotics are not used to improve the nutritional value of milk; pasteurization does not affect the nutritional content of milk.

**Core Concept:** Antibiotics are medications used to treat bacterial infections and are not part of the pasteurization process, which involves heating milk to reduce pathogens and improve shelf life. The nutritional content and flavor/aroma of milk remain unaffected by pasteurization.

**Why Each Wrong Option is Incorrect:**

**Option A:** Antibiotics are medications used to treat bacterial infections and are not involved in the pasteurization process. Antibiotics do not alter the nutritional content of milk; pasteurization does not affect the nutritional value of milk.

**Option B:** Antibiotics are medications used to treat bacterial infections and are not involved in the pasteurization process. Antibiotics do not alter the flavor and aroma of milk; pasteurization changes the milk's flavor and aroma due to the heating process.

**Option C:** Antibiotics are medications used to treat bacterial infections and are not involved in the pasteurization process. Antibiotics do not improve the shelf life of milk; pasteurization