This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Unknown
[{'content': 'Which of the following vaccines can be adminis¬tered to a patient with known anaphylactic reactions to eggs? \nSelect and explain. \nA. Haemophilus influenzae type B vaccine, B. Influenza vaccine, C. Measles vaccine, D. Mumps vaccine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Haemophilus influenzae type B vaccine is not an egg based vaccine and is safe to administer to a patient with a history of anaphylactic reactions to eggs. Influenza, measles, mumps, and yellow fever vaccines are egg\xadbased. Vaccines often contain materials other than the active-immunizing antigens, such as preservatives, antibiotics (e.g., neomycin, streptomycin) to prevent bacterial overgrowth, adjuvants to enhance immuno\xadgenicity, and stabilizers. Patients who are allergic to neomycin should not receive the measles-mumps-ru\xadbella (MMR) and oral polio vaccines. Patients who are allergic to streptomycin should not receive the live or the killed polio vaccine.', 'role': 'assistant'}]