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: ENT
Nasopharyngeal Ca involve: 
Select and explain. 
A. Nasal cavity, B. Orophaynx, C. Oral cavity, D. All
A: Nasal cavity
Answer: A: Nasal cavity 
Explanation: Nasopharyngeal cancer arises from fossa of Rosenmuller in the lateral wall of nasopharynx and can spread to various sites.