This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Pediatrics
Uncommon in children - 
Select and explain. 
A. Ewing's sarcoma, B. Neuroblastoma, C. Osteosarcoma, D. None of above
D: None of above
Answer: D: None of above 
Explanation: Ans. is 'd' i.e., None of the above o Osteosarcoma is the most common primary' malignant bone tumor in children and adolescent, followed by Ewing sarocoma.o In children less than 10 year, Ewing Sarcoma is more common than osteosarcoma.o NeuroblastomaEmbryonal cancer of peripheral sympathetic nervous system.Third most common pediatric cancer account for about 8% of childhood malignancy.NB is most commonly diagnosed neoplasm in infant account for 28-39% of neonatal malignancy.90% of case diagnosed at age of 5 year.