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: Pathology
[{'content': 'Following injection of lymphokines, the same class of immunoglobulin are produced. This is to be referred as: \nSelect and explain. \nA. Group switching, B. Clonal selection, C. Hybridisation, D. Class switching', 'role': 'user'}, {'content': 'Answer: B \nExplanation: . Clonal selection', 'role': 'assistant'}]