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: Social & Preventive Medicine
[{'content': 'The following is true for ‘Live Vaccines’ EXCEPT \nSelect and explain. \nA. Two live vaccines cannot be given simultaneously, B. Live vaccines should not be administered to a patient of Leukemia, C. Live vaccines engage certain tissues of the body, D. With an exception, immunization is generally achieved with a single dose of live vaccine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]