This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
[{'content': 'Interleukin - 7 is produced by which one of the following - \nSelect and explain. \nA. Macrophage, B. B cells, C. T cells, D. Stromal cells', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Spleen,bone marrow stromal cells Reff: Anantganarayan & Panikers textbook of microbiology 9th edition pg:154 table 15.3', 'role': 'assistant'}]