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

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