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: Microbiology
[{'content': 'T cell-dependent region is - \nSelect and explain. \nA. Cortical follicles of lymph node, B. Medullary cords, C. Mantle layer, D. paracortical area', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Periarterial lymphoid tissues\n\nThymus-dependent (T cells collection)\n\n1. Spleen\n\xa0 \xa0 - Periarterial lymphoid collection\n\xa0 \xa0 - Malphigian corpuscle in the white pulp\n2. Lymph node\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0- Paracortical area\n\nThymus-independent (B cells collection)\n\n1. Spleen\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0- Perifollicular region\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0- Mantel layer\n2. Lymph node\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0- Cortical follicles\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0- Germinal centres\n\xa0 \xa0 \xa0 \xa0 \xa0 \xa0- Medullary cords', 'role': 'assistant'}]