This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Pathology
Peripheral nerve sheath tumours include all except: 
Select and explain. 
A. Schwannoma, B. Neurofibroma, C. malignant peripheral nerve sheath tumor (MPNST), D. Synol sarcoma
D: Synol sarcoma
Answer: D: Synol sarcoma 
Explanation: Peripheral nerve sheath tumours are composed of cells that show evidence of Schwann cell differentiation. These include the three common types, schwannoma, neurofibroma, and malignant peripheral nerve sheath tumor (MPNST). Synol sarcoma is not a type of peripheral nerve sheath tumours.