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': 'CD 4 is not impoant for which of the following - \nSelect and explain. \nA. Antibody production, B. Cytotoxic of T cells, C. Memory B Cells, D. Opsonisation', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Opsonisation', 'role': 'assistant'}]