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: Microbiology
[{'content': 'Transfer factor is an example of \nSelect and explain. \nA. Innate immunity, B. Adoptive immunity, C. Natural active immunity, D. Artificial active immunity', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Adoptive immunity occurs following injection of immunologically competent T-Lymphocytes known as transfer factor.', 'role': 'assistant'}]