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
[{'content': 'Most common cause of mass in posterior mediastinum in children - \nSelect and explain. \nA. Rhabdosarcoma, B. Duplication cyst of oesphagus, C. Lymphoma, D. Neuroblastoma', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. is \'d\' i.e., Neuroblastoma "Most common posterior mediastinal masses in children are neurogenic tumors". -- www.merck.com. Posterior mediastinal mass in children I) Neurogenic tumors (Most common) 2) Foregut cyst (Second most common) 3) Lymphoma (Third most common) 4) Germ cell tumors 5) Lymphangiomas and agiomas Mediastinal neurogenic tumors are Mediastinal neuroblastoma Ganglioneuroma Ganglioneuroblastoma Schwannoma Mediastinal pheochromocytoma', 'role': 'assistant'}]