This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General Immunity, Subject name: Pathology
Following injection of lymphokines, the same class of immunoglobulin is produced. This is to be referred as: 
Select and explain. 
A. Group switching, B. Clonal selection, C. Hybridisation, D. Class switching
B: Clonal selection
Answer: B: Clonal selection 
Explanation: Ans. is 'b' ie Clonal selection