This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pediatrics, environment and nutrition, Subject name: Pathology
All of the following are examples of a round cell tumor, except - 
Select and explain. 
A. Neuroblastoma, B. Ewing's sarcoma, C. Non Hodgkin's Lymphoma, D. Osteosarcoma
D: Osteosarcoma
Answer: D: Osteosarcoma 
Explanation: osteosarcoma is not a round cell tumour but all others are. the lace-like pattern of neoplastic bone produced by anaplastic tumour cells is seen here. Source robbins basic pathology 7tyh edition page no.1295. chapter bones, joints and soft tissue tumours.