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 follicle of lymph node, B. medullary cords, C. mantle layer, D. paracortical area', 'role': 'user'}, {'content': 'Answer: D \nExplanation: T cell areas are:\n\nPeriarterial lymphoid collection\nMalpighian corpuscles in white pulp\nParacortical areas.', 'role': 'assistant'}]