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
All of the following are examples of round cell tumours except? 
Select and explain. 
A. Neuroblastoma, B. Non Hodgkin's lymphoma, C. Osteosarcoma, D. Ewing's sarcoma
C: Osteosarcoma
Answer: C: Osteosarcoma 
Explanation: Small round cell tumours of childhood are:

Retinoblastoma.
Neuroblastoma.
PNET.
Rhabdomyosarcoma.
Lymphoma.
Medulloblastoma.
Wilms tumor.
Ewings sarcoma.