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
CD 4 is not impoant for which of the following - 
Select and explain. 
A. Antibody production, B. Cytotoxic of T cells, C. Memory B Cells, D. Opsonisation
B: Cytotoxic of T cells
Answer: B: Cytotoxic of T cells 
Explanation: Opsonisation