This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Raji cell assays are used to quantitate \nSelect and explain. \nA. Complement level, B. Immune complexes, C. T cells, D. Interferon level', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ref Robbins 9/e p207 The Raji cell assay is an in vitro method for detecting complement fixing immune complexes in serum samples. The Raji cell is a lymphoblastoid cell with B-cell characteristics derived from a Burkitt's lymphoma cell line. It has low affinity Fc receptors for binding immunoglobulin and high affinity receptors for binding complement", 'role': 'assistant'}]