Final answer:
Unpasteurized milk should not be served to high-risk populations as it can pose a risk of foodborne illnesses.
Step-by-step explanation:
The item that can be served to high-risk populations is unpasteurized milk. Consuming raw or unpasteurized milk can pose a risk of bacterial contamination, such as Salmonella and Campylobacter, which can cause foodborne illnesses.
High-risk populations, such as pregnant women, young children, elderly individuals, and those with weakened immune systems, are more susceptible to these illnesses, so it is important to avoid serving unpasteurized milk to them.