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: Pathology
Rodent ulcer is ? 
Select and explain. 
A. Infectious ulcer, B. Hypersensitivity, C. Basal cell carcinoma, D. Squamaous cell carcinoma
C: Basal cell carcinoma
Answer: C: Basal cell carcinoma 
Explanation: Ans. is 'c' i.e., Basal cell carcinoma Advanced basal cell carcinoma may ulcerate and extensive local invasion of bone or facial sinus may occur after many years of neglected or in unusually aggressive tumors, explaining the archaic designation rodent ulcer.