This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharynx, Subject name: ENT
Keratinizing squamous cell carcinoma of nasopharynx is 
Select and explain. 
A. Type I, B. Type II, C. Type III, D. Type IV
A: Type I
Answer: A: Type I 
Explanation: WHO classification based on histopathology Present WHO terminology Former terminology Type I (25% Keratinizing carcinoma Squamous cell carcinoma Type II (12%) Nonkeratinizing differentiated carcinoma * Transitional cell carcinoma * Intermediate cell carcinoma * Lymphoepithelial carcinoma Type III (63%) Nonkeratinizing undifferentiated carcinoma * Anaplastic carcinoma * Clear cell carcinoma * Lymphoepithelial carcinoma (Schminke type is tumour with diffusely distributed malignant tissue) * Spindle cell carcinoma (Ref: Diseases of Ear, Nose and Throat, P.L Dhingra, 7th edition, page 283)