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: Pathology
[{'content': "A rare disorder characterized by begin growth in the lymph node tissue throughout the body is called \nSelect and explain. \nA. Castleman's diseases, B. Heck's disease, C. Darter's disease, D. Crohn's disease", 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]