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
Most common posterior mediastinal tumour is 
Select and explain. 
A. Dermoid, B. Neurofibroma, C. Lipoma, D. Lymphoma
B: Neurofibroma
Answer: B: Neurofibroma 
Explanation: The most common tumour of posterior mediastinum is neurofibromas,which constitutes around 75% of the total.Other tumors include ganglioneuromas,aneurysm of descending aoa,lymph node mass. Reference:SRB's manual of surgery,5th edition,page no:1126.