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: Surgery
[{'content': 'Thymoma is associated with all EXCEPT: \nSelect and explain. \nA. Myasthenia gravis, B. Hyper /3-gamma globulinemia, C. Panhypopituitarism, D. Ulcerative colitis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hyper fi-gamma globulinemia REF: Harrison\'s Principles of Internal Medicine 17th ed chapter-e12 "40% of patients with Thymoma have another systemic autoimmune illness related to the Thymoma" "About 30% of patients with Thymoma have myasthenia gravis (most common), 5-8% has pure red cell aplasia, and 5% have hypogammaglobulinemia" "Among patients with myasthenia gravis 10-15% has Thymoma. Thymoma more rarely may be associated with polymyositis, systemic lupus erythematosus, thyroiditis, Sjogren\'s syndrome, ulcerative colitis, pernicious anemia, Addison\'s disease, scleroderma, and panhypopituitarism. In one series, 70% of patients with Thymoma were found to have another systemic illness"', 'role': 'assistant'}]