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
[{'content': 'M. C. anterior mediastinum tumor is \nSelect and explain. \nA. Thymoma, B. Neurogenic Fibroma, C. Lymphoma, D. Meningocele', 'role': 'user'}, {'content': "Answer: A \nExplanation: 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", 'role': 'assistant'}]