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: Pediatrics
A 1-year-old child presented with a swelling in the left flank with episodes of flushing, diarrhea, sweating and bone pain. The diagnosis is - 
Select and explain. 
A. Neuroblastoma, B. Wilm's tumor, C. Medulloblastoma, D. Pheochromocytoma
A: Neuroblastoma
Answer: A: Neuroblastoma 
Explanation: Ans. is 'a' i.e., Neuroblastoma Clinical manifestations of neuroblastoma o Because neuroblastoma arises from neural crest derivatives of sympathetic nervous system, it produces catecholamines. o So, it may cause clinical feature due to : 1. Primary tumor 2. Metastais 3. Catecholamine secretion