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
Which of the following condition is associated with thymoma? 
Select and explain. 
A. Myasthenia gravis, B. Rheumatoid ahritis, C. Scleroderma, D. Renal failure
A: Myasthenia gravis
Answer: A: Myasthenia gravis 
Explanation: In patients with myasthenia gravis, thymus is abnormal in 75% cases, it is hyperplastic in 65% and thymoma is present in 10% of cases. Reference: Harrison's Principles Of Internal Medicine 18th edition chapter 386.