This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Breast, Subject name: Pathology
Myasthenia gravis is associated with 
Select and explain. 
A. Thymoma, B. Thymic carcinoma, C. Thymic hyperplasia, D. Lymphoma
A: Thymoma
Answer: A: Thymoma 
Explanation: Some 60%of Myasthenia gravis are associated with a peculiar reactive hyperplasia of intrathymic B cells and another 20%are associated with thymoma, a tumor of thymic epithelial cells. Robbins basic pathology 9th edition page no 800,heading =Myasthenia gravis Option 4 is correct