This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mediastinum, Cysts, and Neoplasms, Subject name: Surgery
M. C. anterior mediastinum tumor is 
Select and explain. 
A. Thymoma, B. Neurogenic Fibroma, C. Lymphoma, D. Meningocele
A: Thymoma
Answer: A: Thymoma 
Explanation: Ans is 'a' ie Thymoma RememberMost common mediastinal mass-Neurogenic tumorsMost common Ant. mediastinal mass-ThymomaMost common Middle mediastinal mass-Bronchogenic & pleuropericardial cystsMost common Posterior mediastinal mass-Neurogenic tumorMost common malignant mass of mediastinum-LymphomasMost common mediastinal mass in children-Neurogenic tumor