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': 'Two live vaccines the minimum duration between injections should be \nSelect and explain. \nA. 2 Weeks, B. 4 Weeks, C. 4 Months, D. 6 Months', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Directly from CDC guidelines\n\xa0\nThe timing and spacing of vaccine doses are two of the most important issues in the appropriate use of vaccines.\n\nIf the live vaccine is given first, it is necessary to wait at least 2 weeks (i.e., an incubation period) before giving the antibody. If the interval between the vaccine and antibody is less than 2 weeks, the recipient should be tested for immunity or the vaccine dose should be repeated.\nIf live parenteral (injected) vaccines (MMR, MMRV, varicella, zoster, and yellow fever) and live intranasal influenza vaccine (LAIV) are not administered at the same visit, they should be separated by at least 4 weeks.\nAn exception to this recommendation is yellow fever vaccine administered less than 4 weeks after single-antigen measles vaccine.', 'role': 'assistant'}]