This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardio thoracic surgery  , Subject name: Surgery
Tumours of anterior mediastinum include the following except 
Select and explain. 
A. Thymoma, B. Lymphoma, C. Germ cell tumour, D. Schwannoma
D: Schwannoma
Answer: D: Schwannoma 
Explanation: Schwannoma is a benign nerve sheath tumor arising from Schwann(neurilemmal)cells.Anterior mediastinal tumors include retrosternal goitre,aoic arch aneurysm,lymph node enlargement,thymoma,teratomas,dermoid,Pleuro-pericardial cyst.