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: Medicine
Extranodal marginal zone (MALT) lymphomas can involve thymus in the setting of: 
Select and explain. 
A. HIV, B. SLE, C. Sjogrens syndrome, D. Crohns disease
C: Sjogrens syndrome
Answer: C: Sjogrens syndrome 
Explanation: Extranodal marginal zone (MALT) lymphomas It involve the thymus in the setting of Sjogren's syndrome or other autoimmune disorders The lymphoma cells often express IgA instead of IgM on their surface. Other tumors that involve thymus: Castleman's disease Germ cell tumors Carcinoid tumors thymoma. Ref: Harrison, E-18, Chapter e-20.