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': 'Runt disease is due to \nSelect and explain. \nA. Hypogammaglobulinemia, B. GVHD, C. Autoimmunity, D. Immunosuppression', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Runt disease is graft versus host disease produced experimentally in Laboratory animals.', 'role': 'assistant'}]