This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and PNS, Subject name: ENT
[{'content': 'Most common malignant tumour of nasopharynx in children is: \nSelect and explain. \nA. Lymphoma, B. Rhabdomyosarcoma, C. Carcinoma, D. Neuroblastoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Rhabdomyosarcoma is the most common malignant tumour of the nasopharynx, though all of the above are seen with different frequency.', 'role': 'assistant'}]