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: Pathology
The commonest site for extragonadal germ cell tumour is - 
Select and explain. 
A. Retroperitoneum, B. Sacrococcygeal region, C. Pineal gland, D. Mediastinum
D: Mediastinum
Answer: D: Mediastinum 
Explanation: None