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
M. C. anterior mediastinum tumor is - 
Select and explain. 
A. Thymoma, B. Neurogenic Fibroma, C. Lymphoma, D. Meningocele
A: Thymoma
Answer: A: Thymoma 
Explanation: Remember
Most common mediastinal → mass Neurogenic tumors
Most common Ant. mediastinal mass → Thymoma
Most common Middle mediastinal mass → Bronchogenic & pleuropericardial cysts
Most common Posterior mediastinal mass → Neurogenic tumor
Most common malignant mass of mediastinum → Lymphomas
Most common mediastinal mass in children → Neurogenic tumor