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
[{'content': 'Common about tumors of PNS and Nasal Ca-a) Sq cell Ca is the M.C. typeb) Adeno Ca is the M.C typec) Melanoma can occurd) Adeno cystic Ca \nSelect and explain. \nA. a, B. bc, C. ac, D. b', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]