**Core Concept**
Pasteurization is a process used to eliminate pathogens from liquids, particularly beverages and dairy products. It involves exposing the liquid to a controlled temperature for a specific period, which is sufficient to kill the microorganisms without affecting the nutritional value or quality of the product.

**Why the Correct Answer is Right**
The correct temperature for pasteurization is typically around 72°C (161°F) for a duration of 15 seconds. This temperature and time combination is sufficient to kill most vegetative bacteria, viruses, and other pathogens. The heat denatures proteins, disrupts microbial membranes, and inactivates enzymes, ultimately leading to the death of the microorganisms. The pasteurization process is named after Louis Pasteur, who first developed the technique in the 19th century.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not specify a temperature or duration, making it an ambiguous choice.
* **Option B:** This option is incorrect as it may be too high or too low for effective pasteurization, potentially affecting the product's quality or nutritional value.
* **Option C:** This option is incorrect as it does not provide a specific temperature, and its duration is unclear, making it an impractical choice for pasteurization.

**Clinical Pearl / High-Yield Fact**
A common temperature used for pasteurization is 72°C (161°F) for 15 seconds, which is effective against most pathogens. It is essential to note that the specific temperature and duration may vary depending on the type of product being pasteurized.

**Correct Answer: C. 63°C for 30 minutes.**