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': 'Which of the following is the finding in lymphoid tissues in individual with common variable hypogammaglobulinemia \nSelect and explain. \nA. Decreased B cell count, B. Increased B cells count, C. Normal B cell count, D. Absent B cells', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref Robbins 8/e p233,9/e p241 Making a definitive diagnosis of primary hypogammaglobulinemia There is no single diagnostic test; CVID is a diagnosis of exclusion. Laboratory testing shows hypogammaglobulinemia (low IgG plus either low IgA or IgM, or both) and low specific antimicrobial antibody responses despite immunization.', 'role': 'assistant'}]