Final answer:
A student with an anaphylactic reaction to baker's yeast is contraindicated for the hepatitis B vaccine, as this reaction can be life-threatening and baker's yeast is used in the production of this vaccine.
Step-by-step explanation:
An anaphylactic reaction to baker's yeast is a contraindication for the hepatitis B vaccine. An anaphylactic reaction is a severe allergic response that can be life-threatening, and baker's yeast, which is a component used in the production of some vaccines, can be a potential allergen. It's important to ensure that vaccinations are safely administered, especially in individuals with known allergies to vaccine components. In the given scenario, the student should be aware that the yeast used in the production of certain vaccines can cause anaphylactic reactions in those with a history of yeast allergies. Therefore, they would need to seek alternative vaccination options or specific medical advice.