Final answer:
Meat and fish are great food sources of B12, as they are high in protein and contain B vitamins. Examples of meat and fish that are good sources of B12 include liver, eggs, and seafood.
Step-by-step explanation:
A great food source of B12 is meat and fish. These foods are high in protein and contain a good amount of B vitamins, including vitamin B12. Some examples of meat and fish that are good sources of B12 include liver, eggs, and seafood.