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
Which of the following is not a true association of thymoma ? 
Select and explain. 
A. Myasthenia gravis may be seen, B. Hypergrammaglobulinemia, C. Pure red cell aplasia, D. Superior mediastinal compression syndrome
B: Hypergrammaglobulinemia
Answer: B: Hypergrammaglobulinemia 
Explanation: The usual association is hypogamaglobuthemia not hyperglobulinemia.