This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nasopharynx, Subject name: ENT
[{'content': 'Which is the best prognosticator of survival from nasopharyngeal carcinoma? \nSelect and explain. \nA. High angiogenesis in the tumor, B. WHO type III histology, C. Lung metastases, D. WHO type I histology', 'role': 'user'}, {'content': 'Answer: B \nExplanation: WHO type PATHOLOGY Risk factor Other factors Survival/ Recurrence I 25% Keratinizing Squamous cell differentiated carcinoma Smoking Low risk population Older age Non familial factors 10% Survival II 12% Non keratinizing Squamous cell differentiated carcinoma EBV Preserved foods Familial factors 50% Survival III 60% Non keratinizing Squamous cell undifferentiated carcinoma EBV High risk population, Children Preserved foods Familial factors 60% Survival Best prognosis Type 3 NPC- Poorly differentiated, EBV Associated & Best prognosis The undifferentiated NPC havea higher local tumour control rate with therapy although theincidence of distant metastasis is also higher.', 'role': 'assistant'}]