This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunity, Subject name: Pathology
Myasthenia gravis is associated with: 
Select and explain. 
A. Hypergammaglobulenaemia, B. Thymoma, C. Squamous cell carcinoma, D. Hepatic adenoma
B: Thymoma
Answer: B: Thymoma 
Explanation: (Thymoma): Ref: 882-HM (476- Basic pathology 8th)MYASTHENIA GRAVIS: - In which the acetylcholine receptors (AchR) in the motor and plates of the muscles are damaged.* Several other autoimmune disease have been found associated with MG such as autoimmune thyroiditis, rheumatoid arthritis, SLE, pernicious anaemia and collagen vascular diseaseThymoma is the most common primary tumor of anterior mediastinum associated with M. gravis* Thymoma are known for their association with paraneoplastic syndrome, These include: Myasthenia gravis (Most common) hypogammaglobulinaemia, erythroid hypoplasia (Pure red cell aplasia), peripheral T. cell leukaemia, multiple myeloma, other autoimmune disease associations and other systemic malignancies.